I loaded up Super Demo World The Legend Continues (a Super Mario World Hack available at http://fusoya.eludevisibility.org/lm/dw.html ) on my Super Everdrive and it works great. It's a 48Mbit expanded rom and loads in less than 2 minutes. The game is a bit on the hard side with save points being few and far between. Most people just play it in an emulator and use save states, but for those of us who like to play games on the original hardware we don't have that option. However, I did whip up a quick patch that allows you to save the game whenever you complete a level. Use this patch after you've already patched the game to become Super Demo World TLC. Enjoy! http://www.mediafire.com/?kufm6695et66k5h
The hack is impressive, though there are some levels that glitch out on real hardware, and even more that are downright unfair and assume you will be using savestates.