Although presumably we'll have to wait a little while for the full impact of X06's Live Marketplace offerings to be made apparent, one particular bit-crater over which the dust has settled contains a demo of SEGA's new Sonic the Hedgehog title.
Shown off on both PlayStation 3 and Xbox 360 at the Tokyo Game Show last week, and previewed and everything, the new title sees Sonic and a few of his friends (including the blasted Tails) taking on Sonic Adventure-style levels, which mix insane speed and puzzle-solving.
New characters include Silver the Hedgehog, who can use telekinesis to manipulate things, which is great for solving puzzles/showing off SEGA's newfound love for real-time physics.
The demo version on Live Marketplace tonight weighs in at 314MB, although it doesn't offer any details on what's in it and I'm too busy downloading DOOM to care. Sorry.
Edit: I mispelt Tails' name. That's how much I hate him.