I missed this when it was posted, but still it seems too useful not to let you guys know about it. As you might well know by know PSTs are bad for you in almost any kind of Exchange sized shop. Jeremiah Cook cooked for you a nice script to remove PSTs from user profiles. Read all about it here:
http://jeremiahcook.blogspot.com/
Download the script here:
http://www.ccs5000.com/scripts/cleanpstkeys.txt