My name is Kyvinh and I run the AmphetaRate RSS Recommendation Server. I thought it would be benefitial for both our projects to cooperate. Basically, your users, accessing AmphetaRate through your reader interface, would be able to rate blog items. In return, the system will send them recommendations on other items they might like. So please take a look at http://amphetarate.sf.net if you are interested.