I had never read any of the Oz books except the Wonderful WIzard of Oz.  I'd seen the Judy Garland movie several times and frankly gotten a little tired of it.  I'd seen a TV movie with new characters but had not realized there were further adventures actually written by Baum.  These are written for children but everything is so fresh and new they are great fun reads for adults, too.  I'm only part way through the entire collection but am having a great time following Dorothy's adventures in the different worlds.  Not all take place in Oz - so far, I've traveled to Ev (across the great desert from Oz) and a land underground inhabited by people who are vegetables and not particularly nice ones.