Genesis for Normal People by Jared Byas and Peter Enns

 If you are ready to begin a serious study of Genesis, this is a great place to begin.  The authors do a near-perfect job of situating Genesis in its context, in a readable and fun book.  If you have read a lot about Genesis, there will still probably be a few new ideas here, as well as a great example of how to talk about Genesis to newbies.  (Although I don't really buy the "Adam=Israel" thing; I think "garden=temple" works much better.)  (And this book is only $2 in the Kindle store right now.)