It's rare for me to be reading two books at one time, but currently I am.
The Problem of Pain by C.S. Lewis. I've read it before (as well has having listened to it several times on CD). It's an interesting philosophical book that delves into why pain exists in the world. In addition, I am preparing lessons for the Adult Sunday School Class at the St. Paris UMC this spring as it will be what we're reading.
Confessions of a D-List Supervillain by Jim Bernheimer. So far it's a fun, fast read--quippy and humorous and keeps me turning pages. He's done a great job converting what's normally comic book (or at least graphic novel) material into a short novel.