Chris Forsberg of pocketpcdn reminds us about this really cool resource created by Microsoft: We Rock 247. The Smart Client Sample download includes all required SDK's, tools and a source code for web client, winform client, web services and mobile client. The mobile part includes a few applications for Pocket PC and Smartphone (Packman and RoadRunner) and shows how to implement MVC pattern, MD5 password hashing, exception tracing, database wrapper (a la stored procedures), forms stack and many more really useful stuff.