i installed succesfully cwm recovery on ics.
its very simple. a noob can do it.
all credits go to eyeoncomputer.
how reboot to cwm recovery.
unplug charging cable , for some reasons its not working with.
hold menu button in, on front, en hold the powerbutton in too.
keep holding when you see the backlight go on .
backlight go on in about 4 a 5 sec and then release the buttons.
et voila your tablet boots in cwm recovery.
links are : http://db.tt/YgwFCran this is for ICS
http://db.tt/RQG0cwi7 this is for GB