I used to be a preschool teacher in my former life (i.e. before I became a mom!), and when my toddlers reached the age of 2.5, I decided I needed a formal teaching curriculum. When I say "formal," I mean one that was structured but could also be adapted to a parent's limited-resource situation.
This book has been all of that and more. Each activity through the day is listed (from Circle Time through Assessment), as well as recommended books and materials. The subjects are as varied as one could want - from outer space to holidays to nature. I found that with most lessons, even if I didn't have the materials or books, I could usually supplement what we had in our craft box and/or bookshelf to make the theme work. I'd definitely recommend this one.