Metavid is a quite amazing site. They provide video archives of congressional transcripts that are searchable by word. That’s because they have the written transcript as well as video. It’s completely free, and in a wiki format, so errors in transcripts can easily be changed by anyone.
I learned about it at SF WordCamp on Saturday when I asked the guy next to me (whose name I forget) what he was programming while we listened to the speakers. It was Metavid. He said it’s still in beta with a more polished interface coming soon.
Metavid looks to be a seriously useful research tool and is a worthy project indeed.