Well, my first thought when reading the title was, "Duh!".

Books:
1) On the Road - Jack Kerouac
2) 9 Stories - JD Salinger
3) Merck Manual?

Albums:
1) The Band - The Band
2) Bob Dylan - Blonde On Blonde
3) The Rolling Stones - Exile on Main Street
(I'd sneak a copy of the Clash's self titled debut as well)

DVDs
1) Don't Look Back
2) The Big Lebowski
3) Something Will Ferrell, maybe Elf, just cos it's so cheery.

There's other stuff too, but I tried to think fast, and with some thought to how well stuff takes a revisiting.

Pen, notebooks, Dictionary, Guitar.
If Guitar not allowed, then harmonica.
No Movies or CD's. (I'd miss them too much - only having a small selection.)

CDs
Symphony #2 "Resurrection" - Gustav Mahler
March 16-20, 1992 - Uncle Tupelo
Songs in the Key of Life - Stevie Wonder

Books
Hebrew Bible
Beowulf - Seamus Heaney's translation
The Border Trilogy, Cormac McCarthy

DVDs
In the Mood for Love - Wong Kar Wai
The Good, the Bad and the Ugly - Sergio Leone
Contempt - Jean-Luc Godard

Personal Items
Photos
Notebooks
A potsherd I picked up on Masada

CD's:
Pet Sounds - Beach Boys
Elvis Presley - Elvis Presley
Beethoven - The Nine Symphonies

Books:
Oh, the Places You'll Go! by Dr. Seuss
Sacred Games by Vikram Chandra (I haven't read it yet. It's nice an long, and will be useful for a trip to another galaxy.)
Probably a short story collection, either Margaret Atwood or Alice Munro.

Movies:
Groundhog Day
Amelie
Toss-up between Annie Hall or Raising Arizona

Three small items:
tweezers
toothbrush
pens

I may replace one of my movies on DVD for a record of planet Earth. My house and town, friends and family, civilization, etc.

CDs:
Sarah McLachlan
Dixie Chicks
Jann Arden
Not sure which albums in particular. I hope I have time to decide.

Books:
Little House on the Prairie
The Complete Calvin and Hobbes
Charlotte's Web

DVDs:
Star Wars
The Breakfast Club
I'm going to steal Lori's idea and film family and friends for my third dvd

Personal things:
Bronze horse
Gargoyle
Photo album

CDs:
1. "Bruce Springsteen & The E Street Band: Live 1975-1985"
2. "Graceland" Paul Simon
3. A mix CD of every Motown song I could fit on it

Books:
1. "Angela's Ashes" Frank McCourt
2. "From Alice To Ocean" Robyn Davidson (photos by Rick Smolan)
3. "A Tree Grows In Brooklyn" Betty Smith

DVDs:
1. "To Kill A Mockingbird"
2. "As Good As It Gets"
3. Probably a comedy for the third choice, but I can't think of what to pick

Personal items:
1. crossword puzzle magazine
2. my favorite pillow
3. cigarettes (if not allowed to smoke, I'll take sunflower seeds instead)

Books
Zen And The Art Of Motorcycle Maintenance - A world view that spoke to me. Rare.
King James version of the Bible - High point of the English language.
The Complete Tales of Winnie the Pooh - My childhood.

Music
Springsteen Nebraska - If you were young in the rust belt in the 70's you know why. "Put your makeup on, fix your hair up pretty, and meet me tonight in Atlantic City".
The Police Outlandos d'Amour - I was young, strong, hot, and perverted, and had lots of money. A good year.
Wolfgang Amadeus Mozart Requiem Mass in D minor - Beautiful music.

Movies
Sabrina - Billy Wilder, Bogart, Audrey Hepburn, Bill Holden. Linus Larrabee. Nice.
Sunset Boulevard - Billy Wilder, Bill Holden, Gloria Swanson, Erich von Stroheim. Joe Gillis. Sad.
A Clockwork Orange - Intelligent and falling down funny.

Personal
Photos of the folks I do/have loved - Self explanatory.
A knife - Kills and cleans. Use it to eat and fix things and build and open things.
A scarf - If my neck is cold I am freezing. My feet, hands, head or body can be cold but not my neck.

Books I haven't read:
100 Years of Solitude - Marquez
The Art of War - Tzu
The Moor's Last Sigh - Rushdie

Music I haven't heard:
Common/Mr Lif
Miguel 'Anga' Diaz
Berlioz (anthing other than Symphonie Fantastique)

Films I haven't seen:
The Three Colours Series

Personal items I haven't got:
A good penknife
A photo album of friends and family
Summer hat

Books. Only three? Dear God.
• The Blind Assassin by Margaret Atwood
• The last Harry Potter, if I can somehow get my hands on it before the ship takes off; otherwise Harry Potter and the Half Blood Prince
• Some sort of L.M. Montgomery collection, but maybe a bit of chick lit or some Gloria Steinem or the Portable Dorothy Parker or Charlotte Perkins Gilman. I might end up snatching three random books off my shelves in the end.

CDs.
• A mix of Guster songs
• A mix of Tom Petty songs
• "From a Basement on a Hill" by Elliott Smith

DVDs.
• When Harry Met Sally
• Almost Famous
• Lost in Translation

Personal items.
• A typewriter
• A photo album
• My blankie

Book:
Little, Big by John Crowley
Winter's Tale by Mark Helprin
Canopus in Argos: Archives by Doris Lessing

Music:
Decade, Neil Young
Eat a Peach, Allman Brothers
August and Everything After, Counting Crows

DVDs:
The Coca Cola Kid
The Secret of Roan Inish
The Man Who Would Be King

Items:
A lighter
A laptop
A sleeping bag

Books:
The Complete Sherlock Holmes
Pride & Prejudice, by Jane Austen (because I'm obsessed with this book the way that some crazy people become obsessed with Catcher in the Rye, and I will often buy a copy of the book just because I see it in a store).
The Foxfire Book

Music:
Close to the Edge - Yes
Oh Inverted World + Chutes Too Narrow - The Shins, since they'll fit on one 80 minute CD (ugh, I know, but I won't let popularity dictate my tastes).
A mix CD of my favorite Led Zeppelin songs that won't contain Stairway to Heaven.

DVDs
Pictures of my friends and family
Wikipedia CD (because I have absolutely no memory)
The thought of choosing my all-time favorite movie is paralyzing.

Items:
Circular knitting needles, size 8
My flannel blanket that can double as a poncho or a sleeping bag, or even a skirt if necessary
A flashlight (LED, with a hand-crank), because I never have one when I need one.

Can I assume that someone has already built a good reference library? Because, if not, I'll be packing a Pocket Ref, a survivalist manual and a nursing textbook.

(The rest is, of course, pretty much all subject to change at any moment.)

Books:
Collected Fictions, Jorge Luis Borges
Collected Poems, Allen Ginsberg
The World is Round, Gertrude Stein

Movies:
Powaqatsi
Ghost Dog
The Big Lebowski

Music:
King Tubby's Meets Rockers Uptown, Augustus Pablo
Bags' Groove, Miles Davis and the Modern Jazz Giants
The Bootleg Series, vol. 1, Bob Dylan

Items (again, assuming that survival is already taken care of):
a deck of cards
Scrabble
a telescope

CD's:
Beethoven's Ninth Symphony
A mix CD
A meditation CD of Earth birds and water

Books:
3 Natural History/Reference Guides to the New Planet

DVDs:
1 DVD of personal photos, movies, and files
1 DVD of basic survival techniques
1 DVD of physics, chemistry, and medical reference

Three small items:
A good fixed-blade knife
A Leatherman Wave Multi-tool
Spare glasses

"Can I assume that someone has already built a good reference library?"

Got you covered, box.

You realize, of course, that if nobody bothers to pack a CD or DVD player, we're all fucked. Huddling in the dark with our books around mudgirl's flashlight and brandishing our pocket knives.

I never do well with these things. I often choose poorly, and I have trouble packing appropriately for a vacation, let alone a doomsday scenario. Here goes:

Personal items:
- toothbrush
- drawing pencils and paper (how about pairs of things?)
- bass

Music
- Surfer Rosa / Pixies
- What's Going On? / Marvin Gaye
- Rites of Spring / Stravinsky

DVDs
- Out of Sight / Soderbergh
- Crash / Cronenberg
- Modern Times / Chaplin

Books
- Poe Collected Stories / Edgar Allen Poe
- A Thousand Plateaus / Deleuze and Guattari
- Oxford English Dictionary

I know I'll change my mind about some things right after I hit post, but here goes:

Books: 1. "Sacred Origins of Profound Things" by Charles Panati
2. "The Stand" by Stephen King
3. "Little Nemo in Slumberland" by Winsor McCay (thanks, Shane!)

DVDs: 1. "Secondhand Lions"
2. "League of Extraordinary Gentlemen"
3. "The King and I"

Music: 1. Vivaldi's "Four Seasons"
2. MeatLoaf's "Bat out of Hell"
3. Shakira - anything, I love her!!!

Personal Items:
1. Picture albums
2. Diary/Journal
3. Drawing pencils and paper

If I'm going to another planet, why am I taking anything from this planet with me? Would there not be things to do on that planet? Like colonization or something?

For books I'd probably need to learn how to do whatever it is I'm gonna be doing on the new planet, so I'd want instruction manuals on whatever that would be, and also perhaps instruction manuals on how to operate a spaceship in case the pilot has a coronary just before we land.

For music I'd ask the guys on the ship with me if they know any tunes or could play instruments, and in the downtime when we're not working towards colonization, maybe we'd do singalongs or something.

I just think there'd be a lot to do on a colony ship. Who has time for DVDs and books? Considering my lack of experience in microgravity, I'd be too busy trying to keep my lunch in my innards to waste time on stuff that wouldn't have to do with survival. My collection of Billy Joel music would be rather tame compared to all the new things we'd be experiencing. Maybe some Van Halen to broadcast towards pesky aliens you wanna scare away. I wouldn't want Van Halen for my personal collection though. Just as a weapon.

Toothbrush probably. Maybe toilet paper. Do we have sufficient supplies of air, water and food?

...Okay. Maybe I'd want to bring the complete works of The Judys, because something of true value should survive the end of the Earth.