Kech over at PS2DEV has just released his port of Open Mugen for the PSP. Open Mugen is a 2d Beat-em-Up. I've played this game on Linux before and it is a lot of fun. Right now, it's still pretty rough. But expect it to get better as the Open Mugen project progresses further. Currently OpenMugen runs on Windows,Linux and XBOX, and now the PSP.
Here's a few screenshots, if you'd like to have a look.
Es que la versión de Windows está verdísima, le hacen falta muchos supercontrols y triggers, aparte de cosas básicas, como los escenarios y tal, aunque no es precisamente básico, lo importante es que implementen todo lo que tiene MUGEN.