Putting this in literary criticism because puns do pop up in quite a few books.
I can honestly say this is not something I would have picked up on my own, and it was included in My Book Box for this month. Berkowitz takes the reader on a tour of Pun Competitions and brief history or look at puns in general. There is also a bit how puns are different than other comedy.
It's an interesting book, and give more respect to puns. Funny at times. If you like wordplay, read it. If you don't, you can skip it.