This is a very useful application that allows you to send files through adhoc. Very simple to use. Link for file is http://www.megaupload.com/?d=N5TOO3HK . Instructions are.

Press L or R to scroll though directories on your mem stick.
Triangle brings up the file menu (copy/move,make directory,rename,delete or exit application).
X = send selected files (it then searches for a psp to send it to).
Square = Receive a file.

Make sure your game folder kernel is 3.XX or it will not work

Put in Game Folder

Don't know if you guys already knew this....but hey here it is

P.S. Both PSP's must have this app