I got excited when I heard that Charlez Petzold is authoring a Book called “Programming Windows Phone 7 Series”. To add icing to the cake, he is already offering a draft preview of his eBook FREE of cost!
This preview ebook contains six chapters in three parts (153 pages total). Get more details over here
You can download the eBook in PDF and XPS format over here
More updates to come soon. Stay tuned!