It's no secret that the PSP (as with any system) gets ports of games from other consoles. Most of the ports to PSP logically come from the PlayStation 2. But all that is starting to change. With the PS3 on the rise and the PS2 on the decline, PSP is starting to get ports from some unexpected places.
The DS has many a game that it's shared with the GBA, but recently it seems like more and more GBA games are jumping over to Sony's portable. The most obvious of these are all of the recently announced Final Fantasy projects. From Final Fantasy Tactics to just plain ol' Final Fantasy, these GBA remakes are being remade again for the PSP. But it doesn't just end there, the PSP will also see a port of the GBA RPG title Riviera (which is great for me, since I never played that game).
Of course, while it seems like quite a few PSP games are from GBA land, that isn't the only system sending off titles to PSP's library. Xbox games like Xyanide and Painkiller: Hell Wars are reported to have versions coming out this year for PSP and the DS racer Asphalt Urban GT 2 will be out shortly. Even the PC isn't exempt as fantastic physics platformer Gish has a release date for our system of choice.
The future though seems to be the Wii and PSP connection. While Alien Syndrome is one of the only Wii/PSP games announced so far, the fact that Wii games have to be developed independently from the rest of the home consoles means many developers may be looking to PSP versions as another source of profit. Of course as with any business move, these ports will have to make money if this is to become a serious trend.