"Harvard Education Letter" is published bimonthly at the Harvard Graduate School of Education. This issue of "Harvard Education Letter" contains the following articles: (1) Early Childhood Education at a Crossroads: Access to Preschool Has Come a Long Way, but Critical Choices Lie Ahead (Deborah Stipek); (2) Bridging the PreK-Elementary Divide: Concerns about Early Achievement Gaps Prompt Programs That Link Prekindergarten with Elementary School (Sue Miller Wiltz); and (3) From Literacy to Learning: Catherine Snow on Vocabulary, Comprehension, and the Achievement Gap. Online version may contain additional articles.