Steve Stafford is a pillar of the Revit community. There are some great free downloads at his site, AEC Advantage.
Check out the downloads page:
http://www.aecadvantage.com/links2
There is a great document on Revit Roles in a practice, and a cool example of how to handle non-perpendicular Grid Display. You can also find a Door Family tutorial handout from AU.
Thanks for the plug!