My friend Tim O'Brien put together a really cool new site called PresidentFeed.com. It is sort of like a live running poll of Presidential candidate approval ratings. You cast your vote for a candidate you like, and you can remove that vote and give it to someone else later if that guy (or gal) does something stupid. On top of that you can also add "thumbs up/thumbs down" ratings to candidates (think Tivo, without the neat sound).
On the tech side it's all ajax web 2.0 style built on Rails. I love the look, I hate the ugly banner add at the top, but hey gotta pay for the hosting somehow.
Tim is also running a blog about it over at http://presidentfeed.blogspot.com. Check it out.