I can't say I care much for Tom's anymore. They tend to be the type of review site to run 5 tests and declare one piece of hardware "dominates" another. I'm sure the benchmarked data is accurate, but the tests they run on CPUs in particular are poor choices. They run a mix of tests where the tests are highly optimized for AMD and the next highly optimized for Intel. These types of tests don't tell you anything. I still look at Tom's, as occasionally they write a decent enough article, but there are better sites out there. The big problem I have is that I think Tom's gives better reviews to their sponsors. I can think of a few motherboards which were piles of garbage that got awards on Toms. (Gigabyte boards somehow get great reviews - I personally have had problems with all 3 systems I built in the past with their boards.)
Anandtech is a very good review site (
http://www.anandtech.com). They tend to be very fair in testing. They run a mix of real life and synthetic benchmarks. Some of these are optimized for one CPU or another, but at least it's not just 5 tests and a bad conclusion. Anand himself is a pretty bright guy as well and his conclusions are usually on the money IMO.
Aces Hardware (
http://www.aceshardware) is another good site, but it is written for a slightly more knowledgable audience than AT or Tom's. The articles they have are generally very insightful and the benchmarks they run (usually a lot of them) are very fair and balanced and IMO help you to understand the performance of what they are working on. The authors on this page are the most tech savvy of any major review site I regularly visit.
Hard OCP (
http://www.hardocp.com) has reviews and news. Their reviews are typically well written, but to be honest I think they are biased toward AMD CPUs a little bit. (Not to the point of dishonesty though. It just seems like they pick gaming benchmarks where AMD CPUs generally beat out their P4 equivilants.) HardOCP is definately geared toward the hardware enthusiast.
Ars Technica rarely does reviews, but when they do they are the most technical I've yet seen. (
http://www.arstechnica.com) They have a good forum and keep up on tech news that often doesn't get noticed by other sites.
Other reviews sites I can think of are:
http://www.sharkyextreme.com, http://www.amdzone.com (possibly biased
), tecchannel.de (I can't remember the exact address), and extremetech. There are many others as well.