In a startling first, the hilarious Star Wars episode of Robot Chicken is now available for download on the Xbox Live Marketplace, over two months ahead of the DVD's scheduled release date. This episode will run you 240 Microsoft points, and is worth every cent. It's awesome, and if you haven't seen it I highly suggest you check it out.

This gives some real insight to the way of downloadable content; I don't know of anything else download-wise that has been available for purchase before a hard copy. If you are interested, it can be found from the Marketplace blade>Video Store>TV Shows>New Arrivals.