We like CM too!
Right now we are using a Living books approach but with Sonlight. We are using two cores and we love it. It helps to have a direction, so Sonlight takes the planning and guess work out of it right now.
I loved the book
A Pocketful of Pinecones by Karen Andreola, it's a work of fiction but it sort of "teaches" you the nature dimension of CM, in an easy read, living books way! I highly recommend it. But I read all about CM methods for free online, by reading articles at Penny Gardner's site, and Catherine Levinson's site.