Youtube tries out flashless videos with HTML5
by Tug Agency | 21.01.2010

You can now sign up to a beta testing area which will run all your videos without the need for a flash plugin which should lead to a much better user experience, less crashes and hopefully all run a little faster.
This is currently only open to Chrome and Safari users but we can’t imagine firefox will be far off. The only limitations are it won’t play full screen and if they have ads, or aren’t available in h.264, you will get the usual Flash player.
Add yourself into the beta here http://youtube.com/html5