For homeschoolers using the Montessori Method, here's a great website to check out:
Here's a quote describing the program:
NAMC's 3–6 Montessori Homeschool Program is an all-inclusive program that provides you with everything you need to set up and put into practice a three-year homeschool educational program for your child. In a convenient, single shipment, you receive all the curriculum, materials, preparation instructions, and support material you will need to build a solid homeschool foundation. The program is rooted in Montessori philosophy and methodology and is designed to meet the cognitive, emotional, social, and physical development needs of your child.
I can't imagine anything more helpful for a mom using the Montessori Method for her preschoolers!