T. E. McComiskey has edited a great shorter commentary series on the Minor Prophets. I own the older version in three separate hardcovers, but Baker recently republished it (Jan 2009) as a single volume (hardcover). It is big and fat (just over 1400 pages), but it is well worth the 30 bucks (+ a small shipping fee) WTS books is selling it for. I paid just under $100 for mine a few years back…sigh….
I also appreciate the format of the commentary. The author gives the translation as well as grammatical/textual notes along with a running commentary – the two are parallel, but separate on the page. If you’re not up on the Hebrew, you can still benefit from the commentary without having to wade through the Hebrew syntax/grammar. If you are up on the Hebrew, the text notes are great and easy to understand. Each author also gives a helpful bibliography at the end of each commentary section.
Contributors include Raymond Dillard, J. A. Motyer, Joyce Baldwin, Bruce Waltke, Tremper Longman III, and other able scholars. This one is a “must have” for a mere thirty bucks!