I recently did an interview for piece in the Puget Sound Business Journal and the article by Skip Ferderber was also posted to TechFlash.
I really enjoy developing My Trips for Windows Phone. The platform and tools are extremely easy to pick up if you are an existing .Net developer. I had never written a mobile application before and was up and running in a short period of time.
If you are a developer or know how to code, go grab the free developer tools and start building! http://create.msdn.com