Here is a great presentation from the RCFL on managing digital evidence. Watch it here.

The associated presentation/toolkit is located here.

Here is the main site. http://www.rcfl.com

The DOJ finally release an updated version to their guide for first responders.

Electronic Crime Scene Investigation: A Guide for First Responders, Second Edition
Computers and other electronic devices are being used increasingly to commit, enable, or support crimes against persons, organizations, or property. This National Institute of Justice guide is intended for first responders to a variety of crime scenes who may have the responsibility of protecting, recognizing, collecting, and preserving electronic evidence at the scene. (NCJ 219941)

You can get it here.