This is a maintenance release which mainly solves the following issues:

Changes:

Fixed screen corruption while changing CPU speed in PS1 games.
Retained the overclock speed after exiting game/app while nethostfs is active.
Fixed adhoc PC nethostfs connection problem. You no longer need to mess with the wlan switch.
The MP3 will now resume at the exact position when switching firmware versions (1.5 iR Shell to 3.x iR Shell, or vice versa).
Fixed the nethostfs crashing when fails to connect to the server. Nethostfs should no longer crash the PSP.
Fixed autoboot plugin problem with some configurations. The updated version should fix the issue.

http://forums.qj.net/f-psp-development-forum-11/t-release-ir-shell-36-public-116051.html