NES mods that incorporate a screen and controls into a cartridge in the past, but this example from Airz in BenHeck's forums is just so clean and well-polished that we had to give it some love. Inside Airz says it's just a generic Chinese media player that can play NES, Gameboy, and Gameboy Color ROMs, along with the relevant controller bits, a 2.8-inch LCD, 4GB of storage, and a rechargeable battery. Oh, and if you're feeling particularly retro, you can hook it up over TV-out and play on the big screen. Not bad -- and it's for sale if you're as in love as we are. Video after the break.
[Via 8bitfix; thanks, Gusto]