Thanks to a fantastic volunteer effort by Mark Blackford, the DSLR Observing Manual has been revised and improved.
To read more about it and download a copy (free-of-charge) please click here:
DSLR Observing Manual - Version 1.4
Be sure also to take a look at Mark's Photometry Software Calibration and Photometry Tutorials available on the website for the first time.
Thank you Mark!