There used to be some really awesome videos on youtube, but those have since disappeared for some odd reasons. There are a few videos on the Crew Resources & Scheduling under PBS help videos, unfortunately they didn't bring over the really solid videos from the youtube page. Other than that check out Delta PBS information. The PBS gouge PDF is a pretty good document with lots of examples.

http://www.pbshelp.info/delta/PBS_Gouge.pdf