I just finished "Super Mario Bros. 3mix" based on Danfun's recommendation. I liked it, it was quite fantastic. Now I just wish somebody could port it to SNES (I LOVE the snes version of SMB3. It misses the mark on 1, 2 I could care less about, but 3 is a masterpiece.) I think it could be doable, using Super Mario World as a base (widely and extensively hacked if you weren't aware) and the graphics of SMB3 from all stars (I used to have a hack that was just a graphics hack that did that very thing... wish I remember what it was called) and used Lunar to make the levels. The difficult areas would probably be the physics hacks (gravity), the new enemies, and the new music. Not sure if SMW can be hacked extensively enough to allow these.