In a never ending search for great resources on Digital Photography, I recently came across this one: The Digital Picture.  Now I'm a Canon guy, and it slants that way, so it suits my 'lifestyle'.  If you're from the Nikon camp, you might like to check out Nikonians. 

There's a great section with detailed reviews on just about every lens you could imagine (for a Canon SLR body).  Their reviews and ratings track very closely with preferences and suggestions that pro photographer friends of mine have made.  So I'll assume they're pretty spot-on here.

You can also find some nice tips for shooting, and understanding what your camera is actually doing.  All in all it's a very nice collection of information about Digital Photography.  Whether you're Canon or not, it's worth a peek and a read.