Mr. Hirtle quite usefully reviews five author addenda that are designed for authors at the point of negotiating copyright with publishers. I'm planning on using it for my classes on copyright for authors and recommend it.
"Author Addenda:An Examination of Five Alternatives" by Peter B. Hirtle
Cornell University Library
D-Lib Magazine November 2006 Volume 12 Number 11
This page is a very rich resource for all the topics listed in the title. I particularly like the currency of the links and their organization. Being of a medium length and level of detail, it links out to more detailed resources in the various categories:
Initiatives & Projects
Articles, Papers & Reports
Laws, Policies & Court Opinions
If you're going to pattern your page after an existing one, you could do a lot worse!