Netflix Instant has really been improving, in my opinion. For a while, there wasn't very much that I wanted to watch. But recently I've noticed that the library has really expanded. Now available - all prior seasons of Buffy, Angel, 24, X-Files, Lost, The Office and 30 Rock. My requests, please release Alias and West Wing! Battlestar would be another great release.
The streaming quality is really good over my PS3 - the HD shows look incredible. That's what drew me into Lost in the first place.