Tomorrow is Sonic the Hedgehog's 20th anniversary, and SEGA is celebrating by releasing a demo for Sonic Generations. You'll get to have a crack at a "classic" platforming Sonic level and a "modern" level, all in stunning 3D for those that have enabled televisions.
Also announced for the PlayStation Network is a 20th Anniversary Bundle, which includes Sonic the Hedgehog, Sonic the Hedgehog 2, Sonic the Hedgehog 4: Episode 1, Sonic Adventure and a Sonic 4 Dynamic Theme. The bundle will cost $19.99.
So far, the Bundle's only been announced for PSN, but Xbox Live will probably get an equivalent.