Google has been letting people upload videos and now the ones marked as free are available for viewing. From the Google Blog:
The clips play right in the page using the brand new Google Video Viewer, which was created by our engineer Aaron Lee using code from the open source Videolan project. It works great in both Firefox and IE, and we've designed it not to fight with any other video plugins you might have. We're releasing the Windows version first, with Mac coming soon.
Great to see VideoLAN in use.

Check out http://video.google.com