This site, Wikisori.org, seems like a nice resource for parents/teachers who use the Montessori method of education. I haven't had a chance to browse the site with depth but so far what I've seen looks very nice.
I hope to spend some time browsing around the site and insha'Allah, there will be much that we can benefit from insha'Allah. They have albums that have detailed lesson plans (called presentations in Montessori education), and the materials & information they have starts at 3 years old. Topics they have include: Practical Life, Language, Math, and Science.
Insha'Allah, you'll find something that you can use in your home and/or classroom insha'Allah. I've added it to the list of Useful Websites (on the left hand side of the page) to make it easy to find again if you should wish to do so insha'Allah. Enjoy insha'Allah!