These two books are EXCELLENT:
Montessori Read and Write
Montessori Play and Learn
Both by Lynne Lawrence
Also, you can check out this woman's online albums:
http://www.ux1.eiu.edu/~cfsjy/mts/_link.htm
And Michael Olaf is always good:
http://www.michaelolaf.net/1JChome.html
There are some other places to read/find info, but these are among the best. I haven't been such a fan of other materials, specifically for under 2.5 year olds, I see too much independence being forced rather than allowed to unfold naturally.