Actually, ADMT doesn't copy files, it just walks the ACEs for SIDs. IKWYM though, during our AD migration, we could sure tell what machines were clogged up with lots of files.
I use a GPO to set the IE cache to just 32 meg. On my Citrix farm, I set it to delete temp IE files on close.
_________________________
Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.