Hmmm - looking at bookselves:
Lots and lots of health related, mostly considered "alternative."
Some history and archeology, ditto.
A little poetry.
Quite a few instructional type, practical books.
Mostly spiritual, inspirational books from various religions, many rather ancient.
Some Dave Barry. Some Calvin and Hobbes.
Lots of herbal and similar books.
Lettering and art instruction.
Politcal such as Ann Coulter etc.
I like books about weather, and National Geographics.
Any interest in the Middle Ages? I have been recommending a historical fiction book called by Louis L'Amour called Walking Drum. It was a good read.