I've been unable to find a reasonably priced photography course in my area and have decided that perhaps the best thing to do is buy a good book on the topic. I recently purchased a digital slr (Nikon d70s) and am interested in learning how to use all of its features effectively. I have never owned an SLR (digital or otherwise) before, and need something that will teach me all about apertures, focal length, white balance and everything else. I am also interested in learning composition theory to help me take better photos whether with my digital slr or with a point and shoot camera. I've looked through Amazon for books on these topics and the number of results is staggering. Are there some books that stand out above the rest?