Lumo has updated his 3db loader, used for 3d modelling on the PSP, to version (preview) 3. You can download the full suite of updated tools below, here is a list of changes in this version:

changed doublesided to singlesided meshes & backfaceculling (-> draws only visible triangles, front side! Planes might be invisible, because of orientation)
new conversion tool (as cmsh might be v2, v3 i just call it v2 now...)
rewrote maya export script to export the faces in correct* order
added Gouraud Shading -> no more flat view!
added a light
note: max face/vertex count is 65xxx (not limited by my loader) but you can split your mesh into multiple 3db files and load em up...