For a daycare, you might check out the National Association for the Education of Young Children's web site...
They offer accreditations for daycares and is a good starting point.
We take our child to Chesterbrook Academy (which is not on NAEYC's list) in Lisle and I cannot say enough great things about it. I know they have several locations in the Naperville area as well. The staff has been wonderful and our daughter loves it there!