My favorite tips for Settings on my Nikon D3100
Photography ideas and tips
Tips on getting the most from your Nikon D90
Hands down the most helpful site I have found for using my Nikon D5100.
Very helpful guide re: settings for Nikon D3300
Nikon's 10 Best Lenses - pin now, read later.
Nikon D5200 Controls - This will be very useful I think!
Nikon D7100 Review/Tips/Tricks
Photography - Education & Inspiration
D700 AF Settings - Ken Rockwell
Photoshop & Photography Tips
Very detailed article for adjusting your camera's settings for the photo you want. A ten part guide.
Great guide to Nikon lenses. Ken Rockwell (good for all things Nikon, really!). He says get the Nikon 35mm f/1.8 and you'll be ready for practically any shot.
Photography - Tips, Tricks & Tutorials