Quote Originally Posted by 'zanthor',index.php?page=Thread&postID=213149#post 213149
Resilience is 100% disabled inside instances as of 3.0.

Edit: Or am I talking out my ear? I can't find any reference to this actually taking place - I thought that it was implimented to limit the desirability of PVP gear for PVE players, especially the 5 man tank squads of doomshaman...
Afaik, that is not true. It was a proposed change during the WOTLK beta, but it never went live.