A book for young readers that came out a few years ago called Dorothy Of Oz written by Roger S. Baum, the great-grandson of L. Frank Baum. This was published by Toto Too, Inc., who have printed also printed several of his other Oz books, one of which was Lion Of Oz that was also turned into a made-for-DVD animated movie. Dorothy Of Oz, is a semi-direct sequal to the first few Ozbooks.
In it, Dorothy is called back to Oz by Glinda to stop a Jester who has been possessed by the power of the wand of the Wicked Witch of the West, and using it to turn people in to china dolls. Dorothy sets out with Lion, Scarecrow, and Tin Man to find Glinda and Ozma for help. Along the way, they befriend the princess of the China Country, Wiser the owl, and the living tugboat Tugg.
It's a good story for kids, and the book has some wonderful illustrations by Elizabeth Miles. The great thing is though that a full-length CGI movie is in the works which is set for a 2011 release.