Adpinion is a new online ad network with a twist: it lets users give each ad a thumb up or a thumb down and serves the subsequent banners according to these user preferences it remembers. Two ideas: would be cool to have the ads bookmarkable and embeddable.
Readers at Techcrunch where the story broke are skeptical and wonder why people would bother to rate an ad. I think it's a good idea. If people are stuck with viewing ads (not everyone using a comprehensive ad blocker), they can just as well turn them into useful information.