I like the Nintendo DS and Sony PlayStation Portable, but my dream portable gaming unit is a handheld Nintendo GameCube. With Nintendo distancing itself from expensive, traditional uses of gaming technology it is extremely unlikely that we'll ever see an official version of such a thing, but there's always hope for the unofficial. Consider this portable GameCube created by hardware hacker Techknott, for example. GamerCrave has the story.
All the original GameCube controls and guts are built into an acrylic base with a backlit LCD screen. There are also backlit Gamecube logos on the front and back, which gives the mod a more professional feel. A memory card is built in, and the panel with the screen pops up to reveal the disc tray. Techknott says this mod took a few weeks to build. “The case didn’t come out quite as id hoped it would,” he writes. “Mainly because I used a torch for polishing it (not experienced enough) and because the acrylic kept sticking when I was cutting it.” Don’t be so hard on yourself, man.
Without battery support it's completely impractical, but I still want it. I can't imagine when I'd have time to play it or how I'd carry it with me out into the world, but being able to enjoy Super Smash Bros. Melee, The Legend of Zelda: The Wind Waker, and Super Mario Sunshine at just about any time would inspire me to come up with some sort of solution.