Exercise physiology, energy and nutrition by McArdle, Katch and Katch is a particularly useful one, although isn't exactly light reading. Really helped me out with my University assignments as a starting point for research.
Any of Peter Lemon's research on protein has also provided insight for me into my own diet although I do think there are a few problems with applying his findings to the typical T-Nation reader!
From a non textbook/journal aspect, I'm a big fan of John Berardi's articles. "Limit protein to 20g per meal?" on precision nutrition is a favourite of mine: I don't agree with everything word for word but definitely made me think outside the box when it comes to research on protein intake.