What kind of information are you looking for? Are you hoping for reliability/cost-of-ownership type stuff or things like new car reviews that talk about performance and ergonomics and the like?
If the former, quantifying reliability is such an imprecise science I think it really pays to look at a bunch of different sources. Every one of them calculates things a little differently and draws from different data sources, and the ratings on the same cars can be quite different. I think the best resource for this is the Consumer Reports annual used car guide (which you can buy from them or get from the library), but I wouldn't consider it definitive.
If the latter, I really personally don't put too much stock in "professional" car reviewers. The only thing they're really good for is giving you some ideas about what you should be looking for while you're doing test drives. Just googling for "(year, make, model) reviews" should give you a good variety of them.
Last edited by GreasyJack; 10-27-2010 at 06:34 PM.