Microsoft's "Kodu Game Lab" - often labelled the "LittleBigPlanet of the Xbox 360" - is now available for download via Xbox Live Community Games.
It's only $US5, which considering that it lets you create many different types of game, is a pretty good deal.
Kodu comes with some basic single and multiplayer game modes includes, as well as a world builder, along with some simple tools to create AI and programming commands.
Sure, it's not as pretty or as stylish as LittleBigPlanet, but then, it's only $US5.
Kotaku AU Note: It's also unfortunately not available in Australia as the Community Games channel is still limited to North America.