Rick's Nikon Cameras Webpage

Nikonians.org, forums and resources for owners of Nikon cameras. (Their D3000/D5000 forum)
Nikongear.com has forums, galleries, etc. about Nikon.
Nikon Cafe has discussion forums dedicated to Nikon photography.
Nikon D5000 User's Guide by Ken Rockwell.
Nikon World Magazine, available online or on paper.
We recently got a Nikon D5000 DSLR camera. It has 12 megapixels, a articulated screen, and it can shoot 720p video clips.
Digitutor is Nikon's website with various information that includes basic knowledge, useful techniques, and tips on taking good photos with Nikon Digital Cameras. Their D5000 Digitutor
Nikon my Picturetown gives you 2GB of free storage.