5 of 6 people found the following review helpful
Designing Web Reputation Systems,
This review is from: Building Web Reputation Systems (Paperback)
This book lays out the options you have for integrating reputation systems into a site, and helps make design choices (e.g. should I use thumb or star ratings).
The theoretical discussion of terms and concepts is well balanced with anecdotes and examples from real sites (typically Yahoo properties).
Not covered are algorithms (apart from one simplistic formula for factoring the number of ratings into an overall ranking), and much more could be said about how to deal with people gaming the system (incl trolls and spammers).