Examples of some sources for reviews:
Cinefiles (Pacific Film Archives)
Reviews and articles on 25,000 films.
Movie Review Query Engine (For current films)
Very good site for current film reviews from a wide range of magazines and journals.
Cinema Sites (Meta film site created & maintained by David Augsburger)
Links to reviews on the web.
Internet Movie Database
In Focus (Baseline)
URL: http:// pkbaseline.com/screen/infocus/
Current reviews, boxoffice and other information.