C-SPAN has a really interesting site for showing the debate videos. It has a transcript search, a blog aggregation, a twitter message board and so on.
Here are some screen-shots:
This might be even more interesting: Performance Group Blends Video Art, Public Service
“Three MIT grads have devised a way to “remix” the presidential debates â€” live. Friday night in Boston, they used custom computer software to analyze the candidates’ movements and speech patterns in real time, with a nightclub vibe.”