Two of the most brilliant nature photographers out there have websites of their own:

Jim Brandenburg has some fabulous pics on his site. There is also a short interview with Brandenburg in NikonNet.

Lanting also has a website. Not as many photographs there, but a lot of content that is interesting to browse through.

Steve McCurry has an absolutely awe inspiring gallery of photographs on his website. I am grateful to reader Jeff Halbrook for sending this lnk to me.