Here's my review. Comments are appreciated...
Hybrid Recommender Systems: Survey and Experiments
In [Burke, 2002], Robin Burke makes a survey of existing recommender techniques and systems and he also presents and evaluates a hybrid recommender system.
Burke defines a recommender system as "any system that produces individualized recommendations as output or has the effect of guiding the user in a personalized way to interesting or useful objects in a large space of possible options." Put differently, a recommender system assists users in finding relevant information (for the specific user) from a large information space.