Alot of people ask how do i get UMD Emu to work (like blitz in irc) so heres my noob files get it here:
http://www.megaupload.com/?d=U2PZFI98
This is for 1.5 PSP ONLY
Now just take these folders and drag them into the root of your memorystick(ms0:\) and thats it then just put your isos in the iso folder and enjoy!