Jacob53 writes "Scott Kurnit is a very bright guy. He founded About.com, and has raised over $8,000,000 for his new business AdKeeper. So, who am I to judge? But his new start-up sounds more like a Saturday Night Live skit than an emerging marketplace."
As someone who actually enjoys a lot of advertising, it sounds only mildly weird to me — the basic idea is to let people easily archive ads they think might be interesting for perusing later.