Super Meat Boy is a rather beefy downloadable title by every conceivable definition of the word, there were actually a few more features which didn't make it into the final cut. Team Meat recently posted a cornucopia of these deleted scraps on its blog, including a handful of unimplemented characters, a few deadly traps and a cheeky intro cutscene for Braid's borrowed protagonist, Tim. (Man, what a creepy guy.)
Check out all the features on Team Meat's blog, and lament the fact that Cave Story's Quote wasn't added to the final game's roster. Man, that game would have been so much easier with a jetpack and a machine gun.