...I've heard it's a very good place to start.
When I decided last year I was going to start towards an art career in earnest I also realized I needed a better foundation and grounding in the principal skills. I visited a few art sites and messageboards and noted some of the books that were suggested. One particular book mentioned was one I'd heard of previously so I went and picked up a copy, Drawing on the Right Side of the Brain. (There's a link in my currently reading section)
The best thing about this book over many art books out there is it helps you re-train your brain. When most people draw they sketch what they THINK they see, which are shorthand symbols for eyes, lips, hair, etc... I learned how to retrain my mind back in my high school art classes but it never hurts to get a fresh start and a new perspective on techniques.
The book also talks about the trancelike state you seem to enter when you're hyper-focused on a project, where hours pass by like minutes. It discusses ways of passing more quickly into that phase from our normal analytical state of mind.
I've just started the book and I'm doing the pre-instruction projects. My "before" and "after" pictures won't be quite as dramatic as some pointed out by the author but I still hope to see a marked improvement by the time I finish the book.
Here's my "draw your hand" exercise: