If you use Nikon, Nikon Digitutor is a great resource!
Digitutor is a Nikon website with short video tutorials about using Nikon DSLRs. That include how to operate the cameras, including demonstrations of the various modes and settings, useful techniques, and general tips about taking good photos.
In addition to segments about all current DSLRs and some discontinued models, there are also one about the Close-up Speedlight Commander Kit R1C1, and the ViewNX 2 image editor.
You need to have the Adobe Flash player installed to watch the videos. They are only available in English and Japanese.