Here are my favorite sources of information and inspiration...
Developmental Research/Theories
Books
Theories of Development: Concepts and Applications (Crain, Thomas)
What's Going on in There? How the Brain and Mind Develop in the First Five Years of Life (Eliot, Lise)
Einstein Never Used Flash Cards (Hirsh-Pasek, Kathy and Golinkoff, Roberta)
Websites
Attachment/Natural Parenting
Other Stuff- I love that there is a blog for every topic imaginable!
Weelicious
Science A Go-Go
Forward Day By Day
Dirtiest Kid in the World!
Food Politics
Toddler Approved!
Happy Fit Mama!
You Can Find Me Here!