This article offers advice from a developer who’s already begun creating apps for Windows Phone 7. It covers migrating WP7 apps to and from other Windows platforms, how to avoid some of the OS’s glitches, testing and some helpful development tools.
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“Because WP7 is so new, finding information online is a little difficult,” the article notes, “But visiting the forums where Silverlight developers hang out is usually a very good idea. The community is very helpful.”