Koba has updated his PSPInfo to version 0.02. This programs allows you to view the system information of your PSP and overclock it. It can tell you the CPU and GPU speed, as well as the battery voltage and temperature. Here is the detailed feature list:

*new PSP Info Menu*
PSP Firmware Version Detection
PSP Memory available Detection
UMD Detection
USB Cable Detection
PSP remote Detection
Headphone Detection
WiFi: Mac Address view
Skinning is now available, simply create your images, put them in a folder inside the Skin folder, and edit skin.txt to the name of your skin folder.