OK, so perhaps "handheld" is a bit of an exaggeration, but this XBOX 360 laptop mod is nothing short of brilliant. Would be a hoot to crack that puppy open on a plane.
Definitely the work of someone with far too much time on their hands. But way cool nonetheless. Includes high-def 720p display, the ring of light, a built-in webcam, and more.
You can see a demo video here.