I'm currently listening to WICKED, the audiobook. Some of it is very amusing, but the current section is quite serious. I am impressed by the author's creation of names for his characters, and his universe-building skill.
The book is based on the Wizard of Oz story, but tells it from a different point of view, with some interesting parallels to pre-World War II Germany. There's a long wikipedia article, but I'm not reading it until I have finished the whole book. And there are two sequels.
-- Rachel Holmen