Also on my Ramadan reading list is the book On Disciplining the Soul and Breaking the Two Desires by Al-Ghazali. Basically it consists of certain sections from Ihya ulum al-din (The Revival of the Religious Sciences) on asceticism and struggling against the ego, translated and annotated by T.J. Winter. I've also read this one before but I could definitely use a refresher. A few years ago I went through a period of being really excited about Al-Ghazali, but more recently I've kind of mellowed out and haven't "touched base" in a while.
Anything I could say right now about how great Al-Ghazali is would probably sound really lame so I'll just leave you with a couple of links:
A biography of Imam al-Ghazzali by Dr. G.F. Haddad
As a continuation of my muslim art of war idea, here is an excerpt from al-Ghazali on Jihad al-Nafs (with links to other scholar's comments on the same topic).
And here is a huge Al-Ghazali Website with a ton of his writings.