I haven't but looked it up. Looks like it could be worthwhile.
Have you seen Nikon's digitutor on line. I used it a lot when I first got my D80.

Let's see....here it is... http://www.nikondigitutor.com/index_eng.html
It's really pretty neat. You can go throught the film version but I usually just skip that and look stuff up from table of contents.