My good friend Wally McClure has written a short eBook on “Building iPhone and iPod touch Applications for the .NET/C# Developer with MonoTouch”.
You can check it out here
Given that iPhone is a very popular phone and that some of the development barrier for Microsofties like me is no .Net language support (Objective-C being the native development language), this can now be overcome with the help of Wally’s eBook.
Its small and concise with topics covering class library support, deployment and debugging. I encourage you to check it out.