Perfect for homebrew, the NES flash cart

PC

Starcraft Command and Conquer Generals mod

Before Halo there was Marathon

NES and Genesis in one box

PC

Not quite Rez for your PC, but still entertaining

Super Mario for the Genesis?

Got soldering skills? Then you can make a Game Boy Micro GC Link Cable

NES cart reproductions let you play Final Fantasy III, California Raisins and Earthbound Zero on your NES

Unleash the power of your NES

Final Fantasy X for the NES?!?