Since its release on May 9th, Minecraft: Xbox 360 Edition has been selling at an incredible rate, and was profitable in just an hour after it was available for sale. Unfortunately, some of those copies are going to have to be refunded due to a problem with the split-screen feature.
Owners of SDTVs have been unable to use the split-screen feature in the game. This requirement was not previously well-known although MS has updated the description for Minecraft: Xbox 360 Edition to state that a HDTV is need for split-screen. Those who have SDTVs and purchased Minecraft can contact Xbox customer support for a refund.