PSP-Hacks.com

This PSP homebrew app allows you to send any file from your memory stick to another PSP via the "Photo Sharing" function. It simply "injects" your file into a valid jpeg image. The application is then used to extract the hidden file from the jpeg. You're now able to bypass the previous 2MB limit by splitting larger files evenly at 2MB and 're-join' the split files on the receiving PSP.