Microsoft broke gamers hearts when they announced that they never had, and never will have plans for an Xbox handheld.
Well, at least one person took matters into his own hands. Who needs somebody to make your console for you? That's weak!!
This homemade Xbox handheld runs on a battery case and has a built in LCD screen. The games run off a build in hdd, I think since its running evo-x.
The guy also makes a few console portables if you're interested. He's got Dreamcast, PS1, Nintendo and Jaguar for sale.
Check it out here