Christophe Thibault even comes up with an updated version of his xRick port (Rick Dangerous port) for the PSP. Changes:

Updated sources for PSPSDK devkit

Fixed hangs in egypt map

New icon and background image courtesy of Fred Holgado

Added bullet and bomb mappings to Triangle and Square buttons

Added map selector

You can now install PSPRICK in any /PSP/GAME folder

http://www.kaillera.com/psprick/