Russian PSP Homebrew Developer frostegater has updated his nice PSP Everest 2 bringing it to rev 2. PSP Everest 2 lets you easily see all of the details specific to your PSP. If you aren't aware you can find out what version and model you own. Also get details on FW and CFW as well as the battery.
You can get more info on frostegater's work at the source.