I have a huge crush on Miko who's girl crush on Kristin Wiig only makes Miko more crushtastic. It's also economical for me, because having Miko have a girl crush on Kristin Wiig saves me the trouble of crushing out on Ms. Wiig because a girlfriend with a girl crush on someone you're already crushed out on is twice as crushtastic, so my own sans-Miko crush can be applied to other, non-Miko specific crushes, such as dolphinariums and Fiestaware displays.
I'm not in love with Wiig's Orman, (largely because I don't care about the subject enough to gauge how good the impression is) but everything else Wiig does is pretty much comedy gold. At work, so not sure what's online, but I suggest her "Just Kidding" monologue from Weekend Update as a jumping off point. She's pretty much the sole reason I started watching that show again.
Plus, her performance in Knocked Up is just acerbic and wonderful.