The first resource is the SBL's Review of Biblical Literature. It's been around for awhile, but if you haven't visited there, check it out. This site provides book reviews that cover a variety of scholarly and noteworthy studies. The reviews are substantial, usually 4 or 5 pages, and can help you determine if you should consult the book for research or add it to your library.
The second, a newer resource, is the Review of Biblical Literature Blog. Add this to your Google Reader and get a notice when new books are reviewed. When you click on the book link at this blog, you are taken to a second page with a link that will take you to the Review of Biblical Literature. You can also post a comment about the book on this second page.