I've been reading Calvin's Institutes of the Christian Religion. A couple friends have asked me why. To make a long story short: I've met a lot of people with strong views on Calvin, but few or none of them actually read his book.
That's why I read Collected Writings of J. N. Darby too: lots of people were willing to share their opinions of his writing, but very few of them seemed actually to have read it. (I wrote a little article about that for a friend's blog.)
So I'm reading the Institutes. I'm about a fifth of the way through, and I'm hoping that wasn't the best of the book: I've a long way to go yet.