Modsyn has released version 1.2 of his PSpoof program for the PSP.
Heres the info:
Tested using Fanjita's 8.5 loader and USERLUA provided with the 7.0 loader.What it does:
This application allows you to send any file from your memory stick to another PSP via the "Photo Sharing" function. It simply adds your file to a valid jpeg file so the PSP thinks nothing's fishy. Note that the PSP won't allow you to send any image over 2MB. A workaround is in the works.