This very recently published one-volume Handbook arrived at my desk a couple of weeks ago:
The Eerdmans Dictionary of Early Judaism. Edited by John J. Collins & Daniel C. Harlow (Eerdmans Publishing, Grand Rapids, Mi., 2010). xxxvii + 1360 pages. $ 95.
The Dictionary is composed of 13 longer articles (pp. 1-290), and then a lot of smaller typical Dictionary of handbook articles and notes (in fact: 520 alphabetical entries, including 130 illustrations). The publisher provides a list of the major articles here.
As for the favorite focus of this blog, one might pinpoint that Philo of Alexandria has received a 6 pages large general entry, written by Gregory E. Sterling, a three page entry on Philo, Allegorical Commentary,, written by Maren R. Niehoff, a 1,5 page entry on Philo, Apologetic treatises (by Sterling), a two pages long entry on Philo, Exposition of the Law (by Niehoff), a two pages long entry on Philo, Philosophical Writings (by Annewies van den Hoek), and finally a ca 1,5 page long entry on Philo, Questions and Answers on Genesis and Exodus (By David T. Runia). A total of 15 pages (pp. 1063-1080). In addition, he is of course mentioned in several other entries that deal with various topics, as e.g., on allegory (pp. 323-324); Greek philosophy (p. 699), and Ascent to Heaven (p.389).
This volume will surely prove itself useful to both pastors and students, and the bibliographies after each entry enhance its value. An index at the end, however, is missing.