HardOCP - Kyle Bennett's creation. Great site. A legend in the OCing realm.
Sharky Extreme - Good site, long reviews (but thorough). Weekly CPU price chart.
Overclockers.com - Great site with an overclocking database, lots of good articles and guides.
Chicks Hardware - Great site with lots of reviews, news, articles. Lots of updates.
Anandtech - Good site with daily news and good reviews.
G3D: Gaming in 3D - Great site.