Theresa Neil's forthcoming book, Mobile Design Pattern Gallery, is set to be released by O'Reilly in the Fall of 2011.
Theresa launched a site to go along with the book that includes a fantastic gallery of 70 user interface design patterns for mobile devices with 400+ supporting examples from iOS, Android, BlackBerry, WebOS, Windows Mobile, and Symbian applications. The gallery covers a broad range of problems from designing your application's navigation to choosing the right invitation technique.
Check out the pattern gallery, and subscribe to be notified when the book comes out. She's giving away 5 free copies to subscribers.