I am also about halfway through and though I like the book and find it very interesting it is a little bit too much fiction for me.
And the choice in the book club comes to early for me (yes, that's my fault, not your's). I have the book "The Forgotten Revolution"
(
http://www.amazon.com/The-Forgotten-...1848850&sr=8-1)
about science in old Greece on my reading list and would have prefered to read this book beforehand.
Speaking of the middle ages there is a theory that a few hundred years have not been, are just an invention (the time around 700-900). I don't know if this theory has some truth or is just plain rubbish, but I find it quite fascinating and when reading historical books I always look if I can find some arguments for this or that point of view. In this regard I could find only very little in "The Swerve" until now. But this is of course not the topic of the "Swerve", just a sidenote by me.