http://www.ultimateamiga.co.uk/index.php?action=tpmod;dl=item454
Here is the source code for PSPUAE, i guess this will be required as opposed to the WINUAE?
A port of PSPUAE would be awesome! Love to play some old Amiga games on my shiny handheld :D
http://www.ultimateamiga.co.uk/index.php/page,6.html
Its already running on Legacy PSP so hopefully should be fairly easy to port?