I've not got his book for the D7000 but I did have the D80 one, and I assume all his books are done to a template and adapted to each specific camera. So with that in mind is a good book if you find the Nikon instruction book a bit useless/bewildering/confusing.
Busch books are very well written and easy to understand starting at what all the functions do and then building on that with worked examples of different types of shots. It's worth the cover price, but I'd say it's aimed at beginner to intermediate level.
I also had the Simon Stafford book for my D80, which in a way follows on covering the same ground but tends to the a bit more technically written.
When I swapped the D80 for a D7000, I only purchased the equivalent Simon Stafford books, as I prefer something a bit more technical, and I'd consider that much of what is in the Busch book (ie worked examples) is transferable to virtually any DSLR of a similar spec.
In short, if this is all new to you then Busch is a very good read to get you on your way.. coupled to getting out there and using the camera obviously
