Apple has released an iPhone User Guide for iOS 5.1 which is now a free download in the iBooks Store.
The content found in Apple's 293 page iPhone OS 5.1 User Guide is extremely useful, especially when it comes to understanding the power that Siri puts at your fingertips along with setting up iCloud backup.
With iOS 5.1 the camera button is now located directly on the standard lock screen, eliminating the need for a double-tap of the home button to access it — instead, users slide the camera button upward to move the lock screen out of the way and display the camera.
Even though my post is aimed at iPhone beginners, everyone will find some small tip that's bound to make daily tasks like emailing or messaging multiple photos much simpler.
The best part of this user guide is that it's free.