Team Emergency Exit has done it agsin with a brilliant quake 2 port which is in beta but runs along with a high 20 fps at average. There is no sound in this beta 3. There are now working at getting single player. I cant wait single player playing quake 2 in the palm of my hand lol. Here is the link to download quake 2 for the psp.
http://www.megaupload.com/?d=1A22ZTJU