I'm probably just a luddite.
Now, I've seen those ads on youtube videos which are actually music videos, but never on something where they've obviously gone through somehow and autodetected what songs are inside the youtube video and given you an ad based on the soundtrack.
To me, that's big. That's like "We've cracked a way to monetize youtube videos" big and I don't think I've ever read anything about it. Anybody out there in the internets know anything about that?