Just thought I'd chime in with this bit of news -
If you own a standard definition TV, an Xbox 360 and then downloaded Minecraft to play 4 player splitscreen with your friends then you were bang out of luck.
Splitscreen ONLY works if you own a HDTV. A LOT of players have gotten angry over this as it was never stated until the game out (face it no other game in history has had HD exclusive splitscreen)
[link] this link however is now telling people that Microsoft is issuing refunds for not clearly stating this fact when the game first launched so if you're one of those people send them mail with this link.