Quoted from PSPhacks:
There doesn't seem to be a lot of applications for this competition. I shall put mine in. :)
SHELL 0.4 b 690
SHELL is a PSP XMB replacement application. It is developed in C and is still in the early stages of development. It aims at eventually replacing the functions of the XMB. It works on 5.00 M33, 5.03 CFW, 5.50 CFW and should work with 4.01 M33 (untested).
A long jump from last release (289)
Lots of bug fixes and new functions. :)
Functions not implemented show a 8002013C error. ;)
It's an awesome app. :p