We are trying to implement a rule based engine for our portal site. We looked into products like Brokat Advisor, ILOG's JRules amonst others... However, couple of days back - products like IBM's Personalization Server etc were also brought into my attention. After looking into its features - it made be left wondering - what is the difference between Rule Based engines and Personalization servers?? is it just a case of different names for the same features or they do differ in functionality??
the difference is how to implement and manage your content. Personalization could also be done with a different filter mechanism, collaborative filtering(which is used on Amazon e.g.), etc.