Maybe this is old news to some of you, but I posted this on BroBible's Facebook Wall late last night and the concept seems awesome enough to warrant its own post. If you're brave enough to dismante a treasured N64 and know enough about electrical engineering, here's how you can rewire an N64 into a handheld gaming device. All you need is a cheap 7-inch LCD screen, a plastic injection mold, and some sort of genius rewiring to a strong enough power source (unless you know a lot about batteries, you're probably going going to have to plug it in). If you've tried and succeeded in building a handheld Nintendo 64, let me know in the comments. It looks like a damn fascinating project.
Oh yeah, here's a video of a working version, via Hackaday. According to their post, all you need is glue, filler, paint, and a 6800mA battery to go truely handheld.