Group Policy Literature

I am yet to find a good bit of literature on ‘Group Policy.’ I’d like to know if there is a good in-depth article, book, magazine, website etc. (ANYTHING!) that will list all GPEDIT.MSC policies.
For example, I’d like to offer a pop-up when users log-in advising them of Company policies that apply to their use of that company workstation.
Please help!
Thanks, Jim