The manuals are great for understanding the mechanics of your camera and are a great start. In addition, I don't know if they do one for your camera, but I bought a video by Blue Crane Digital for my Nikon D50 and have found it extremely useful. The first time I watched I thought I might be in over my head but I found after playing with the camera for a while and subsequently watching again (a couple of times), I found that I understood and retained more and got more out of it with each subsequent watching.
Good luck,
Chris