Toddlers/Pre-K: Catholic Children's Treasure Box. Just Like Mary, Little Acts of Grace, The Mass Book for Children (All available through Emmanuel Books)
So far we use the Faith and Life Series by Ignatius Press.
For First Communion, Jesus Our Life, Weight of a Mass, and St. Joseph Baltimore Cathechism.
For Saints and Feasts Days, Tomie De Paola Books:
Francis the Poor Man of Assisi
The Lady of Guadulupe
Mary the Mother of Jesus
They Holy Twins
The Clown of God
Patrick: Patron Saint of Ireland
The Legend of Poinsettia
Pascual and the Kitchen Angels
Catholic Mosaic has an
incredible selection of Catholic books at
http://www.hillsideeducation.com/mosaicbooklist.pdfCatholic Heritage Curriculum (CHC) has a decent liturgical book
A Year with God: Celebrating the Liturgical Year