Here are some very useful web sites for finding camera reviews:

For most digital cameras, but not the really high end professional class:

http://www.dpreview.com

For comparisons of digital camera image quality:

http://www.dxomark.com

For reviews of lenses:

http://www.slrgear.com

For generally interesting essays about cameras and photography, including the occasional camera or lens review:

http://www.luminous-landscape.com