Welcome, new PSP-2000 owners to the wonderful world of PSP firmware upgrades. For the uninitiated, these are incremental improvements to the PSP's brain that are supposedly to make the system better, but really just make life more difficult for hackers trying to put homebrew software on their systems. The improvements for 3.70 include:
You can now set custom themes in [Theme Settings] under [Settings].
Support has been added for assigning buttons in [Remote Play].
A scene search feature has been added under [Video].
Sequential playback is now supported under [Video].
Simultaneous playback of content under [Music] and [Photo] is now supported.
...Huh, well, those actually aren't bad, especially now that we can listen to "Friends Forever" while we watch the slideshow that consists of only this picture. Commencing download!