My faves are already all listed here, but here goes:
Slrgear.com for the cool 3D graphs by focal length and aperture. Technical nirvana, but usually short and impassionate.
The Digital Picture is good if you don't need measured results. Very verbose with a lot of good opinion, from a guy who knows how to use the gear.
DPReview isn't my choice because they don't review enough, often enough, and they are also owned by a major retailer of lenses, which detracts from their credence in my mind.
Ken Rockwell is good for entertainment purposes and alternate views... and surprisingly, he has the best tech details of any reviews consistently... what type of autofocus, how many blades in the aperture, is it par focal, does it breathe, etc.
Lastly, I find good merit in Amazon's customer reviews... the default sorting is by voting, IE, the first review listed is deemed the most helpful.