Nikon Cafe has discussion forums dedicated to Nikon photography.
Use PBase Photo Database (PBase) to host and share your photos. It contains galleries and information about various cameras, including the D5000, SD550 and SX110 IS. (Support forums)
Camera Labs was launched in December 2005 as a source of unbiased digital camera and lens reviews. Their DSLR Tips site has photography tutorials, video workshops, lens and accessory reviews. (Camera Labs forum.)
D-Town TV is a fresh approach to teaching camera tips and photographic techniques to today's digital photographers with Scott Kelby and Matt Kloskowski as its hosts. No matter what the skill level or interest, each episode covers a wide variety of topics.