FriendFeed Blog: View your FriendFeed in real-time: "In our new, experimental real-time view, comments and posts will appear at the top of your feed as quickly as they arrive. This is accomplished by a technique called long polling, where our server doesn't respond to your browser's request until there's something it wants to send."
Smooth scrolling updates and pop-out windows! Nice. More SortDurAttentionSuck.