I recently wrote a review on Montessori at Home by John Bowman. You can read it here. It is truly a wonderful resource for anyone who wants to implement Montessori methods in their home. I wish that I'd had it 3 years ago!
I'm planning on implementing many of the ideas and lessons in our summer homeschool (beginning next week!). O(4) said that her goal for the summer is to do "math, math, and more math!" Luckily, Montessori at Home has lots of ideas and information for implementing Montessori math lessons!