Bruce Barnbaum's great book The Art of Photography: An Approach to Personal Expression is on sale right now for all Kindle users. If you got a Kindle Fire for Christmas (like me), you can pick up a digital copy of the book for only $7.19! That's almost 85% off!
There is not a better photography book in print than Bruce's The Art of Photography. If you want to improve your images, this is by far the best starting point.