One of the AskTheAdmin guys, Karl Gechlik published The Ultimate Guide To Your Windows Mobile Phone [PDF] Found at:
http://www.makeuseof.com/tag/the-mak...ile-guide-pdf/
"...This guide starts at the very basics of Windows Mobile, and quietly builds up its pace to a more advanced level. Whether you want to (re)discover the most basic features and applications of your device, extend it with new applications and tools, or even flash a custom ROM, the Windows Mobile Guide comes to the rescue...."