Ideas That Didn't Make The Final Cut In Super Meat Boy
The fine folks at Team Meat have put together a post on the official Team Meat blog that goes over "everything that changed over the course of dev. or was removed entirely (and the reasons why)."
Check out the various iterations our hero went through, hazards that didn't make it into the game, and unlockable characters that never saw the light of day. Read all about it here.