The 31st annual Boston University Conference on Language Development was held November 3-5, 2006, in Boston, MA. The proceedings contains 60 of the papers presented at the conference, including the keynote address by Roberta Michnick Golinkoff and Kathy Hirsh-Pasek and the plenary address by Jürgen M. Meisel. The two-volume set covers a wide range of research in language acquisition and language development. The complete table of contents can be seen on our web site at http://www.cascadilla.com/bucld31toc.html along with easy on-line ordering.