I don't know of any sites that do this (though they may exist). I do remember something like this being demoed as part of the froyo keynote at I/O. I think specifically they showed taking a picture through google buzz. It's something that they're implementing through HTML 5 but it isn't finished yet.
Haha ya chatroulette is just an absolute mess. I go on a site called Shovio.com. Check it out its pretty cool. I can see the broadcasts but I can't video in because it wont recognize any of the cameras on the Evo. I wish it could. Maybe a Froyo only deal?