Homebrew emulator master craftsman uberjack just updated one of his newer emulators: Atari800 PSP.

Atari800 PSP v2.0.3.2 now includes the following changes, additions, and updates:

* Fixed mislabeled 'Joystick Right' control (thanks Robert)
* Updated GUI - menu animations
* Fixed various bugs dealing with controller configuration
* Improved state saving/loading screen

As always, you can glean more information from the readme included. Unlike most other readme files though, the one included in the archived download is an html file viewable in a browser.