I have added a new link in the sidebar of Ex Libris. Under the heading of "Building a Library", I have added Top Commentaries on Every Book of the Bible.
This link will take you to a post by Tim Challies on the Ligonier Ministries blog. Dr. Keith Mathison (author and director of curriculum development for Ligonier Ministries) put together this list of his top five commentaries for each book of the Bible. Judging from the links I've clicked, his choices are excellent!