I'm always staggered and disturbed that so few people know about our Device Management Feature Pack for SMS (probably because it's buried on Microsoft.com).  Essentially this feature pack provides mobile device management of Windows CE (3.0 and later) and Pocket PC 2002 and later devices. 

The Device Management Feature Pack provides the following capabilities integrated into SMS:

• Hardware inventory
• Software inventory
• File collection
• Software distribution
• Settings management
• Password policy management

More details are available on Microsoft.Com at :  http://www.microsoft.com/smserver/downloads/2003/dmfp.mspx

There is also an excellent Webcase which covers it's capabilities here too: