There is this new plugin for Firefox called adblock, created by the folks at eyebeam labs. It's pretty interesting. What I am most interested in is this feature called ad-art, which replaces ads with art. It looks like its curated by many different people. It's free. Damn the man.
Update: My brother just pointed out to me that I referred to the ads as ad-art but the logo is add art. I guess that it works either way- but I see their not so perfect pun.