More info: Answers.com has a page of information on Last Measure.com (which is where on.nimp.org links to), including links of referral sites that will link back to Last Measure and cause havok with your browser. My suggestion is to add the URL's of the referrals to any filters that you have to stop you from accidentally going there.

Even more info: The pop-up/redirect/crash thing is NOT BROWSER SPECIFIC. It runs on a Java script, and has screwed up Firefox, IE, and whatever mathowie is using on his Mac. So the only way to stop this is to not go to the site, or to use a script blocker (and still not go there).

http://www.ericphelps.com/scripting/samples/Hosts/

Windows users should add the address to the hosts file if it is not already there.

I use his updater to auto-update the hosts file from the mvps site and I also add my own entries (like the nimp site) when I need.

I don't know how to do any of this stuff! Explain it to me like I'm dumb! KTHNXBYE!

TPS - ok, are you using Firefox? I'm really not sure about how to do this in any version of IE. Also, I don't feel confident about telling you how to edit your hosts file, as (I don't think) it's something you shouldn screw up. Someone else want to jump in? If you are using FF, then you should have some add-ons installed as they make your browsing safer and easier.
First: download AdBlock Plus. This will block a lot of ads and page elements such as banner ads, and crap like that. There's more info on it at its official site, which tell you how to use it. The learning curve is not at all steep, and remember that by doing this, pages load faster, and you don't have to see a lot of the BUY NOW!!! crap. :)

No Script. What it does is stop all scripts from running on all pages. As an example, if you were typing something here, and you went to click 'Italics', it wouldn't work because the script has been disabled. Easy to fix - right-click the icon on the status bar, and click on the 'Allow metachat.org'. Here's the link to the official site, which has more info. You'll have to allow all the sites that you go to on a regular basis, say, Flickr, for example. I go there and I can't add notes to pictures, as that's disabled. Same with MetaFilter. It's not as annoying as it sounds, as once you allow the site, you don't have to do it again.
I'll write more as I think of it.

Let's not panic the Peanut Gallery. It's not necessary to kill your Domain Name Service client in Windows XP, or set up and maintain some big Hosts file on your machine. It's not even advisable, unless you want any of the tens of thousands of domains that change Web hosting arrangements daily not to work for you speedily, since killing the DNS client kills local address caching, and you'll be hitting your upstream DNS machine a whole lot more. We have the DNS so no one has to constantly keep updating a Hosts file, and frankly, some exploits work by patching local Hosts files with bogus entries, so you can actually expose yourself to some of these old boogey men by doing that.

I don't see why, if you're running Firefox 1.5.0.8 or 2.0, you can't just install the AdBlock Plus extension, and put in a custom filter rule on http://*.on.nimp.org and feel pretty safe. In Internet Explorer 6, you can just go to Tools-->Internet Options, click the Security tab, click Restricted Sites (red icon) and add the same http://*.on.nimp.org URL to block the site.

Case closed.

So... I guess I'll do nothing about this, except avoid that site, and probably have bad dreams about it tonight.

I did not suggest killing the DNS client, just using a hosts file.

"I did not suggest killing the DNS client, just using a hosts file."

True, weretable, you didn't suggest killing the Windows DNS client, and I'm sorry if I seemed to imply you or Zack_Replica did. That's one of the suggestions on the Eric Phelps site that you did provide a URL for, though, and when I saw that, it just raised some old "Windows tips" flags. Let the DNS be the DNS though, I say.

If you kill the DNS client you will only be able to reach sites if you have the IP address. If this Eric dude suggests this as a strategy then he has no credibility. Also, his hosts file is effective but it is also huge and really slows down browsing.