Appcelerator Titanium: Up and Running
Developers of course would be the core audience for this book. This will help them understand how Titanium works, what it does well and what it doesn't do well. In the long standing tradition of O'Reilly, it will be chock full of real world samples to get the reader going quickly. The sooner a developer can sit down with this book, get something up and running and seeing it working on a simulator, or actual device.