Independent Software Vendors (ISVs) have built somewhere around 19,000 applications for Windows Mobile. Microsoft has built a website called Innovate ON Windows Mobile. This portal is designed as part of the Microsoft Partner Program. It is meant for helping ISVs in the development, testing and marketing processes required for creating software. It covers from the very basic resources such as what tools to use and how to install them to access to mobile webcasts, events, etc.
The website comes really handy if you are serious about building software for Windows Mobile because it also provides information on testing resources and how to obtain the "Designed for Windows Mobile" certification. On the marketing side, it also helps out by providing access to the Microsoft Certified Software Catalog (to which your software has access after getting the Windows Mobile certification) and tools to sell your application online with the help of Software Distribution Partners such as Handango, MobiHand, Motricity, etc.
To participate in this program all you need to do is enroll. Becoming a member will qualify you for additional exclusive benefits such as Free Test Vouchers and Tech Support. If you or your company are not a Microsoft Partner, join now for all these benefits.