I know your guys have probably figured out how to print from WPF by now now, but I came across a very helpful tutorial, so will post address incase its of interest to your developers (if they are still struggling)
http://www.switchonthecode.com/tutorials/printing-in-wpf
http://www.switchonthecode.com/tutorials/wpf-printing-part-2-pagination
http://www.switchonthecode.com/tutorials/wpf-print-queues-and-capabilities
It's not entirely off Topic Dominic, Thanks for the good read links for me anyway. :-)
Thx Thomas, I put it as OT because with current guidlines I wasn't sure wherther to post it or not...
Glad I could provide some breakfast reading for you..