There are a TON! I could post book after book after book I have looked through. I personally have been disappointed with the "curriculum" books I have seen though. Most are for teachers or for doing "school at home." Which isn't us.
Here we are a funny blend of Waldorf, Montessori, and "other." Here is what I have to reference, if that helps.
I would suggest at this age getting books to learn how children learn. I have The Three R's by Beechick and just ordered Language and Thinking for Young Children by Beechick.
The closest I have to "curriculum" is
- Little Acorn Learning
I would suggest an art book. We have Little Hands Art Book. Preschool Art by Kohl is also good.
Trish Kuffner has a lot of good preschool books. I have The Preschooler's Busy Book and Picture Book Activities. Picture Books Activities is a book I use A LOT as the basis for what we do. I just ordered The Wiggle and Giggle Busy Book am impatiently awaiting for it to arrive.
A fingerplay book is helpful. Wee Sing, Little Hands, The Complete Book of fingerplays, 1001 fingerplays, are all good.
Creating Readers by Pamela Schiller is an amazing resource for literacy. Pamela Schiller has many preschool books. I was able to find most of them at the library.
BTW, The Little Hands series has books for ABC, Math, Reading, Science, Crafts, Art, Fingerplays, etc which are all for ages 3-6.
Before Five in a Row is a WONDERFUL book and I personally wish I had seen it last year. I do plan on getting Five in a Row next year. B4FIAR is for ages 2-4.
Books for Montessori practical life are also helpful. That's pretty much the only aspect of Montessori we use but believe heavily in it.