I recommend reading the baroque cycle. It really gets into his personality, how much above everyone else he was, and what it would have been like being around him.
is this it? http://en.wikipedia.org/wiki/The_Baroque_Cycle
I'm really not that interested in his "personality". I posted this because I thought it was strange and I just noticed it even though its an older film. I like his work. check out "Newton's Philosophiae Naturalis Principia Mathematica". Newtons work does pre-date Leibniz but people give both credit for intergral calculus.
I read an english translation in high school. I think any person interested in physics and natural philosophy should read it.
I think Newton and Leibniz are extremely fascinating. Especially Leibniz as my background is computer science. They were the 2 smartest people of their time and a couple of the smartest people in history. I'm interested in how such people conduct their lives and what motivates them. That is why I made the remark about personality.