Below are a list of useful websites:

Webopedia: Online Dictionary for Computer and Internet Terms
Webopedia is an online dictionary for computer and Internet technology. Developers can search for terms relating to issues of wireless development, wireless software and mobile applications.

SQL Server Magazine
SQL Server Magazine Online offers SQL forums, FAQs, and reviews. These features can assist in wireless development and WAP query SQL.

Pocket PC Summit
The Pocket PC Summit is the first trade show & conference dedicated to the Pocket PC attended by users, wireless software developers interested in pocketpc development and technology businesses.

Microsoft
Microsoft empowers developers to realize their full potential by providing the richest software platform, development tools, programs and resources to develop and deliver innovative mobile applications for Windows¨ Powered Pocket PC and Smartphone.