Some Golf Rules Web Sites

History of the Rules of Golf John Hutchinson's site on the history of the rules. Everything from the first 13 rules written down in 1744 to the present code.
The Leith Society Members-based discussion group on rules and history.
Rules Blog Weekly Blog on Rules by Barry Rhodes.
Through The Green Source for 2012 changes and learning the rules.
Metropolitan Golf Association Formed by clubs in the New York area in 1897. Good section on rules with excellent videos and tricky quizzes.
Rules and Rants A Rules Blog moderated by RCGA Director of Rules and Amateur Status, Brent McLaughlin
Rogamania A Rules of Golf Blog. The blogger is unidentified but info given seems sound. A bit cynical.
USGA's Decision Book for Mobiles Rule/Decision Book for mobile devices from USGA.  Looks OK in browser also.
Don Lilley's Golf Rules Board UK based Rules Official, Don Lilley, moderates this site.