I want, I want, I want a Pocket Retro Game Emulator. It plays Nintendo, Super Nintendo, Sega Genesis, Gameboy Advance, NeoGeo (why?), eBooks, and FM radio tunage. It's a bit on the small side, but it has an AV-out slot for playing through a TV when I'm not in a car.
But think of the possibilities... Every game I loved that came out before my 15th birthday (plus a ton of more recent ones on the Gameboy Advance), and a ton of gems that I missed out on. Yeah, I can dig it.
If this thing operates exactly as advertised, I can't imagine NOT owning one.