There are a great number of sites out there discussing various topics related to sports and fan relationships - below I have made a list of the most interesting and exciting.
Customerthink: the world’s best site for customer centric approach thinking and publications
The Business of Sports: a great site by Russel Scribetti
The Migala Report: solid articles on the business of sports
SportsNetworker: Lewis Howes’ blog site – great sports related content
PGreenblog: Paul Greenberg’s great blog on CRM (and related matters)
SportsMarketing20: good network place to connect with people in sports and social media