KACE, makers of the KBOX family of appliances can now provide centralized management of the iPhone. Their appliances can provision, configure and control policies on end-point devices:
http://www.kace.com/about/releases/systems-management-appliance/computer-management-software-alternative/08_25_08.php
There is still a big component missing from third party solutions for the iPhone (or a built-in option for that matter), which is the development of a full disk encryption solution for the platform. There are a couple of solutions in development which we are beta testing but nothing that is ready for prime time yet (can you say multiple bricked iPhone’s is bad for business).