You don't have to do anything too sophisticated to get some great results for your users. Check out this article and collaborative filtering library: http://w

You don't have to do anything too sophisticated to get some great results for your users. Check out this article and collaborative filtering library: http://www.igvita.com/2007/01/15/svd-recommendation-system-in-ruby/ http://www.igvita.com/2007/01/15/svd-recommendation-system-i... I actually want to play with this more, so if anyone wants to create a google group to share implementation approaches, etc., just reply to this and I'll create it.