I am new to windows phone programming...any good book to start..so that i can learn the essentials...or any other good website to start with???
There is Petzold's "Programming Windows Phone 7", which is available for free.
Windows Phone 7 apps are Silverlight applications (or mobile XNA apps). If you are comfortable with Silverlight, the Petzold book is a good starting point. If you haven't done any Silverlight (or WPF/XAML), then I'd recommend you pick up a good starter book on general Silverlight - most of the techniques learned there will apply to Windows Phone 7 as well.
Not a book but the best place to start is the Windows Phone App Hub
There are many tutorials, code samples, official design guidelines, forums etc.
Also check out the Windows Phone 7 developer's guide at codeplex.
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