Screwdriver for use with:
Nintendo Wii - also works for accessories(nunchuk, remote control)
Nintendo DS (maybe not DS Lite tho)
Gameboy Advance & Gameboy Advance SP - also for game cartridges
Gameboy Colour
Gameboy Pocket
Gameboy Light
many cellphones, & some other devices, also use 'tri-wing' screws (see info below)

Has a 3-point(sometimes referred to as 'tri-wing') head, which seems to be a rare screwdriver type.

Very useful if you want to modify or repair a console.

Apparently this will also fit the screws on some cellphones etc. It seems there can be different sizes though, so some screws might be too small/large for this screwdriver.
Wikipedia list some items which use this screw type:
http://en.wikipedia.org/wiki/Tri-Wing