Today I saw a fantastic link talking about a new WP7 ebook available for a short time! And it's from the Windows programming guru Charles Petzold!
If you're not familiar with his past work, he's the master of C/C++ Windows programming books. I think it's VERY COOL he's got a book for the WP7. Ya, you can BET I downloaded my copy of the ebook!
Now that you know how to get the first WP7 book/ebook, it's time to grab a coffee and get coding!
Resources:
Charles Petzold: Programming Windows Phone 7 Series
Microsoft Press: Free ebook: Programming Windows Phone 7 Series (DRAFT Preview)
Charlie Petzold: eBook link