Our developer team and AT&T are joining forces on a series of webcasts. One of them is around developing Field Service Applciations with WIndows Mobile. It will cover both commercail applciations and developing your own. The webcast si scheduled for February 21st at 10am Pacific. You can register thorugh this link.
Additional archived webcasts are available on the AT&T DevCentral site on Location-Based Services and development best practices.