Early next year, NBC Universal will launch an advertising website Didja.com. "The site will offer a vast archive of current and classic TV spots, movie trailers and other brand-related content. NBC Universal plans to supply Madison Avenue with a host of data gleaned from Didja, including the results from virtual focus groups. Didja will feature extensive social-networking features (so fans of, say, classic kiddie cereal commercials can geek out together), as well as a mash-up kit that will allow consumers to make their own tributes to brands." - Variety
Already, there are veryfunnyads.com from TBS, a commercials channel on MTV's iFilm/Spike, adTV (read more) and a huge number of ad-collecting blogs and repositories (adsoftheworld.com).