...a program to transfer files from one PSP to another via infrared. The major limitation is that the received file is put directly in the memory stick root, but this will be flexible in the next version. It’s moderately slow, but it works :-) (next version will be optimized)…and I’ll release the source once I’ve cleaned it up. (pspsdk and ReKleSS’s raster graphics library were used.) Read the README in the zip for more information. Link to post. Files here.
IrDA File Transferrer on a PSP