It would be awesome to have PSPDisp ported to Linux. IIRC improvements to existing projects counts, and it would be funny to enter a PSP competition with pure Linux code.
Or you could make an universal client by using the VNC protocol.
A development library to hook the PSP's filesystem calls to provide VFS functionality would also be cool. You could make "magic devices" that aren't currently available like network filesystems. Or stuff like block device access via files like unix. Imagine drawing graphics via fwrite.
"If you have specific questions ... don't hesitate to ask as the more generic the question is the more philosophic the answer will be" - PSPWizard