Portablization
Portablization is the art of taking a console or computer and modifying it to such an extent that it can be fin in a tiny case along with a screen and a controller. (Effectively making it a portable)
Almost every console since the dawn of video gaming has been made into a portable. From the Atari 2600 to the Sony PlayStation. Currently, nothing newer than the N64 has been portablized but various people are working on portable Dreamcasts, GameCubes and PS2s.
Links
A portable NES built on the principal that absolutely no money was going to be spent whatsoever.
The homepage of a guy whose hobbies include creating portable consoles.
Similar to the VCSp below but this is going to be mass produced and sold.
Site about a man who made a portable NES. Includes tutorials so you can make your own.
This is a great website about a man obsessed with ripping apart old consoles and cramming them into a hand-held case with a built in TV. Apart from building 7 different Atari 2600s he has also built a hand-held SNES and PlayStation! Give it a look. (You could even buy one if you put your name down quick.)
Abbibi VS the Portables of Doom
Site with pics, 'how tos' and links from the whole portablization community. Has links to multiple other portablization site.