Ambleside Online: The Ambleside Online curriculum is a free homeschooling curriculum designed to be a modern equivalent to the curriculum that Charlotte Mason used in her own PNEU schools.
Catholic Charlotte Mason: Trailguides, reading lists, and recommended activities for home education the CM way.
Charlotte Mason Research and Supply Company: Karen Andreola's CM site including book reviews, speaking schedules, and resources.
Christian Book Reviews for Homeschooling Parents: Reviews of "living" books for those with a Charlotte Mason style homeschool. Written by parents.
Getting Started with Charlotte Mason: Information on how to jump start a CM education including narration, copywork, and scientific topics.
Higher Up anf Further In: Practical homeschooling help focusing on Charlotte Mason's ideas and Classical Approach. How to implement living books, nature study, folksongs, composer, artist studies and much more.
Mater Amabilis - A Catholic Charlotte Mason Curriculum for the 21st Century: A free Catholic curriculum and resource guide for those homeschooling the CM way.
Penny_Gardner: Resources and information on the Charlotte Mason method, by Penny Gardner, the author of "Charlotte Mason Study Guide."
Simply Charlotte Mason: A database system of living books, resources, and helps for homeschooling the CM way.
The Breathing Room: A site for the encouragement and education of Charlotte Mason homeschoolers.
Yahoo! Groups: Charlotte Mason Study Group: CMSG is an online Christian support group for those homeschooling with living books.