Early Years (if you have young children – early elementary and under) And/Or the audio messages Discipleship Is and Reaching Your Child’s Heart
Hearing and Reading, Telling and Writing (the language arts one)
All of the free books are excellent as well, but I’m guessing you want to know what to buy.
(Alot of people also love the Planning your CM Education Guide which is also good, but didn’t make my top 3 list because I was born planning. =) But if planning isn’t your thing, I’d bump that up too.)
If you’re fairly new to CM I’d get the All-Day Charlotte Mason seminar. She takes you through each subject and explains how to do it. Even after having used the CM method for 6 years, I watched it last year and learned SO many new things. Truly excellent.
Laying Down the Rails would also be on my top 3 as well as the Planning guide.
I agree with the All-Day Seminar (although I know it isn’t a book.)
Planning guide was great (although there is a blog series that has a lot of the information – if money is really tight, or you feel you have planning pretty good)
I have alot of the SCM books, DVD’s, etc. I have yet to get anything that I don’t like from here. The books and Things Seminar is great. Looking Past the Fear CD is great too! Again, these are not books, but are great for moms in the planning phase.