Annie Leibovitz - It's her wiki since she has no official site. Go google her images, they're amazing. You can view the official pictures of the Queen (she requsted for Leibovitz) here.

jOhO - A Singaporean wedding photographer who completely kicks ass.

Mario Testino - I hate his website but I love especially the black and white pictures he took of Princess Diana before she passed away.

FILE magazine - A collection of work by various photographers. Most of the images are really really good. Artsy stuff.

Mused - Another artsy photo site by an Iranian now based in Vancouver.

Joe's NYC - Street photography in New York, done in style.