making 3D games is easier, someone ported irrlicht to PSP, and you have full function over that.
I have had my own 3D mesh running on that previously (a small silent hill clone town).

LTE engine it was called: http://www.ltestudios.com/

I'll show a screenshot soon of what i had running, gotta find my datacable :P

EDIT: here's the 3D mesh proof:



long story short: just get one, i have 3 (yes, dont ask) they are 100% worth every penny!!

EDIT: here's the 3 PSP's proof:



regards,
Dennis