Another site brought back to life this year with all its downloads working was the PSP Coder Miemt, the coder of the very first GBA Emulator for the PSP, before exophase released the excellent GPSP.

Heres some of his releases:

PMP Simple Converter 0.08 Package Lite edition
GBA Emulator for PSP 0.01
MPH Firmware launcher 1.3.7u5u1
Simple UMD Loader Version 0.02 for PSP 1.50
PMPMOD_1_02_M4g3 Plus Edition

Check them out on his DCEmu Site here --> http://miemt.dcemu.co.uk/