IconPackager v4.1 is releasing today, please post questions or requests for help here.
32-bit - None
64-bit - Vista Only: Uninstall sometimes does not revert the drive icons to the Windows default. If this happens to you, either reinstall IP4 and apply Windows Default Icons or, work around this issue by deleteing the icon cache (per these instructions) and reboot.
Follow these steps (Method #1) but don't restart explorer.
In addition, delete all of the files in this folder (before restarting Explorer):