Ok, I am designing the Content Recommendation Engine based on Jeff Eaton's Votingapi. It utilizes the Slope One alogrithm authored by Daniel Lemire at the Univeristy of Quebec. He is also a member of the Drupal community. The engine itself is a sortof api. It provides two basic functions cre_top() and cre_similar(). cre_top() return the top n objects of a spefic type. So for instance, in my node_recommendation module that utilizes these functions, cre_top() returns the top N nodes. cre_similar() returns items that are similar to the specified object. So in node_recommendation this is used to show similar nodes to the one a user is currently visiting (note: this is non-personalized, where as cre_top() is). Current code is in my sandbox, but it shall be moving to contrib/modules/cre and contrib/modules/node_recommendation soon. Currently, I am working on adding views intergration. And I am creating a way for the module to be installed via cron for large votingapi datasets (and if i should do that). It takes awhile to install with large vote sets. Once installed, speed is not a problem. For much more information, http://groups.drupal.org/soc-content-recommedation-engine Comments sugguestions not fit for this list send me an email: sdrreynolds@gmail.com ~Scott Reynolds