I also recommend
Understanding Exposure. It is a great book that tells you how the settings on your camera affect the photos you take. I recently just took it out of the library again and it was still helpful and I have had a DSLR for a couple years now. I shoot in either in Aperature Priority or manual and shoot in Raw Format exclusively and my photos are so much better for it. I learned how and why to do that from the book.
There is so much learn and experiment with....it is really addicting. Just get out there and shoot shoot shoot.
Susan