Links to a variety of Montessori-inspired unit studies - a general Montessori-inspired music appreciation unit and a number of unit studies for specific pieces
DIY Beginning Montessori Phonics for Preschoolers - ideas for inexpensive and DIY sandpaper letters, DIY alphabet box, and inexpensive and DIY movable alphabets. Includes links to Montessori-inspired unit studies with a variety of Montessori phonics activities
Holt Social Studies: United States History: Beginnings to 1877: Interactive Reader and Study Guide
The Ultimate Potty Training Resource! This has links to studies, tips, tricks and free printables.