While reading through the Apache Mahout wiki I ran across a broken link to the Taste documentation on the Quickstart page. The Apache Mahout Taste documentation is here.
Apache Taste is a recommendation engine:
Taste is a flexible, fast collaborative filtering engine for Java. The engine takes users' preferences for items ("tastes") and returns estimated preferences for other items. For example, a site that sells books or CDs could easily use Taste to figure out, from past purchase data, which CDs a customer might be interested in listening to.Taste provides a rich set of components from which you can construct a customized recommender system from a selection of algorithms. Taste is designed to be enterprise-ready; it's designed for performance, scalability and flexibility. Taste is not just for Java; it can be run as an external server which exposes recommendation logic to your application via web services and HTTP.