Equipment & Supplies
Calumet Photographic - it's where the pros go
B & H photo - video - pro audio
Nikon - At the heart of the image
Learning
WPPI - Wedding & Portrait Photographers International
Nikonians - the Nikon user community
ShutterBug.net - Tools - Techniques - Creativity
Admired
World's Top 10 photographers - article in popphoto.com