GM 2007 Online Order/Reference Guide (Good site for WEEKLY UPDATES, and extra info)

This is a nice site for getting a little extra info on your truck (especially for those thinking about buying).  Shows you a lot of things discontinued, and gives you option codes.  It's also supposed to tell you about things to come.  Bookmark it and keep checking it from time to time.

http://eogld.ecomm.gm.com/NASApp/domestic/brandsel.jsp?year=2007&regionID=1