AdBlock for IE: AdMuncher
This works great. Although I miss the highlighting of IFrames and other objects on a page to customize my blocking experience like in AdBlock, the updateable list of ad sites in AdMuncher seem to be near 100% spot on! So I dont have to configure all my pages the first time I visted them like I had to in AdBlock for that firefox junk. Lots of options to tinker with AdMuncher but it has blocked everything I wanted it to, and nothing I didnt so far!
http://adblock.admuncher.com/