A few years back I came up with a reading rotation to make sure that I was reading more than just theological works. It has really helped me avoid becoming lopsided in reading. I simply choose a book from each category and follow through the rotation. Perhaps this will be of help to someone. Feel free to contact if you have any questions.
5. Biography (both Christian and Secular)
7. Church/World History (these are not mutually exclusive categories)
8. Fiction (usually a classic)
9. Contemporary Issues (might include current fiction)