Daily Motion and Youtube have a cool beta on their respective sites. They implemented an early version of their sites replacing flash with the new HTML5

I’m really impressed with Daily Motion’s implementation, 300,000 videos and a full featured website! You need Firefox 3.5 or Safari 4 to view the websites.
http://openvideo.dailymotion.com/
http://www.youtube.com/html5 (Reports are it crash Safari)