A reader of my blog sent me a Joost invite (thanks Ugo!)
Joost is still in beta with a few rough edges, but generally I think that it is awesome! My wife Carol took one look at it and said "I want that!"
The Max OS X client takes over the desktop (if you want), and provides a nice viewing experience. My favorite feature is remembering (an optional setting) which program you were watching and restart the video feed right where you left off.
While I am a huge supporter of Open Content (I was the CreativeCommons.org commoner of the week several years ago for my free web books) I also like to see more commercial material available on demand.