Sexiness counts, 10-10-10, first 10 seconds, first 10 hours, first 10 days. Very important to connect quickly with the user if you want them to keep using the app.

Creative got to the MP3 market first, beating Apple by 2 years. Apple's iPod had worse battery life, less storage, less formats, less features... ... but it looked great. When you put your app up on the marketplace, all the customers see is screen shots initially! ... Make the looks count.

Sample "Enter PIN" UI on the iPhone, recreate in Windows Mobile as an example. Always start with maximised form. Delete the menu too to get a full screen without ugly UI. Strictly is against the UI guidelines, but it gives better user experience.

Site with useful stuff: www.opennetcf.org has libraries that can help; has a lot of MVPs building wrappers and libraries. Extra tip for debugging; Emulator: file -> config -> peripherals -> create text console window for serial port 1! Shows a console with trace information for load-time. Can write to the port if you want to trace to it too.

Most of the coding seems straightforward. Wonder if this all means that WPF is not available for the mobile platform yet. Anyway... just gonna sit and listen for now.