The AD kerbersied print queues for Leopard has been going on for a while now. There was a kprintd package for Tiger but this did not work under Leopard.

But someone has posted a response to a thread i started a while back stating that he has hacked the Tiger package and has now got it working in Leopard. I have not tried this yet so cannot confirm if it works or not. I only post it here for information purposes.

Link to Ad kerberised print queues for os x leopard

If someone does try it please post back with results