There seems to be so much junk out there for the PSP, and no real solid "center" of knowledge about it all.
My current favorite homebrew, aside from the emulators, is "Squarez." (http://www.globware.com/psphomebrew_squarez.php)
It sort of reminds me of Geometry Wars, the bonus game in Project Gotham Racing 2. (Man I wish they would put that on the PSP homebrew scene.)
I also have played PSP Doom, which is nice aside from the fact that there is no music.
I've found a Suduko (?) game as well, which is fun. The pacman clone I found was terrible.
What are some other great, high quality homebrews like Squarez?
Thanks!