I just compared two commentaries on Leviticus on my Participatory Bible Study blog. In addition, I’d like to link to my older review of Jacob Milgrom’s three volume commentary on the same book. From that review:

The only possible adjective for this commentary is “incredible.” It is not just long (2,468 pages of text), but it is packed with useful information, well organized, with the details of the process used in coming to understand the text laid out for examination. A book can be long but not informative. This one uses its space effectively to contain useful information.

All three of these commentaries have been useful to me. Check them out!