Super Mario

• http://www.mariouniverse.com/sprites/snes/smw
• http://www.mariomayhem.com/
• http://www.youtube.com/watch?v=pXHlvHoplKM
• http://www.youtube.com/watch?v=kYhRM6mmAfY

Infinite Mario

• http://www.mojang.com/notch/mario/
• http://www.ultimatearcade.com/game/infinite-mario
• HTML5 (seemed a little flaky for me): http://www.rawrbitrary.com/arcade/infinite-mario-bros-in-html5/