I have just completed work on the next version of my extraction utility, which now has support for .rar files (including RAR3 format).
Hope you guys find this useful.

New features:
Rar support (including RAR3) + passworded Rar support
Directory browsing for file and dir selection (press square over ZIP/RAR file: or Extract To
__SCE__ to kxploit renamer (mainly for iRShell users)
Auto-detects whether launched from iRShell or as standalone

Installation:
2.0+/Standalone: Install as regular application
1.5/iRShell: go into zipplugin folder, and copy OSKGraphics folder and EBOOT into X:/IRSHELL/EXTAPP/APP4 and X:/IRSHELL/EXTAPP/APP5 . Boot iRShell and configure the settings so that zip are associated with APP4 and rar are associated with APP5

Other:
Switch between RAR and ZIP with trigger buttons (rar menu will not do zips and vice versa).
__SCE__ to kxploit will list folders in PSP/GAME and allow you to click any __SCE__ named folder to rename it so that it shows in iRShell App View