AutoStart PRX allows youto specify a number of separate homebrew applications to load at launch. Each application can be bind to certain key. When that key is held during bootup, the PSP will automatically load your homebrew.

Changes:

You can now bypass the autoboot by putting the WLAN switch up.
You can launch PSX games now too.
Rewrote the configurator and the configuration file parser. Configurator looks better and is more user friendly. (Thanks to Mc Cabe for the background)
PRX size decreased thanks to recoding and psp-packer.
No need to enable the prx for game.txt now.

http://forums.qj.net/showthread.php?t=142577