DCC for Dummies
From N Gauge wiki
Marcus' DCC for Dummies
Useful amount of info in an easy to find reference list.
Produced by Marcus Ammann the site contains many links and information covering all aspects of DCC.
The list includes wiring, operating, CV lists, troubleshooting and many many more. There is also a section covering the basic concept of DCC and how to go about picking your system.
Large amount of useful info for anyone using NCE PowerCab.
Well written in a friendly format. A good one to have book marked for those occasions when the answer eludes you.