So you ripped open your PSP and put in a GPS system in it. Now what? You get MapThis! from Deniska. The program uses Google Maps, so it should work all around the world. The maps are customizable, and can even show satellite and hybrid maps. Interestingly, the program works on every version of PSP (albeit a bit differently), so those with firmware 1.0 or 2.7 can enjoy Deniska's ambitious project.
You can see a video after the cut.