Credit for the "return to root" commands to dhacker
To return your device to rooted state.
1)Download terminal emulator, free in the market
2) Open voodoo OTA rootkeeper and click restore root
3) Open terminal emulator, type the following 3 lines exactly, hitting enter after each line (don't miss the spaces)
mount -o rw,remount -t yaffs2 /dev/block/system /system
cp /system/su-backup /system/bin/su
voila, rooted ICS, very tasty