"What's different about Windows Phone 7? Everything. Microsoft has started completely fresh with the design for Windows Phone 7, so old users won't even recognize the new interface, which now uses a system of tiles and hubs. Other major additions include voice recognition, integrated Xbox Live functionality, and multi-touch support."
Nick Mokey over at Digital Trends has written a short guide claiming to be everything you need to know about Windows Phone 7. I guess it really depends on who you are and your overall knowledge of what's been going on in the smartphone world to know for sure if it really is "all you need to know". It does cover all the basics though, and if you've not been following all the discussions and news about Windows Phone 7 then this is a good place to go. The article does have an embedded video from Chris Pirillo that provides a 17-minute walkthrough of an early Windows Phone 7 build.
Windows Phone 7 "One Stop" Overview
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