We've seen modded NES systems before, but BenHeck.com forum member "airz" earned some serious geek cred on Thursday by cramming all kinds of goodies into an NES cartridge.
Airz took a foreign-made portable media player and hacked an NES controller to replace the player's buttons, then stuffed the whole assembly into a Super Mario / Duck Hunt combo cartridge. He then cut out an opening for the 2.8-inch LCD screen and the end result is a handheld NES cartridge capable of playing a complete library of NES games using the original buttons, while also serving as an MP3 player, FM radio, picture viewer, audio recorder, and more.
After going through 3 game cases, 2 controllers, and 2 media players to make the mod work, Airz said he's selling his awesome mod to recoup his losses.
Image Credit: forums.benheck.com airz