Hosea. Herm. Fortress Press, 1988.
My favorite commentary on Hosea. What is particularly useful is his outline of the nature of God as demonstrated through images, listed in the introduction. This helps organize the book in a useful manner, bringing it more to the level of the layman. Highly technical. Highly recommended.
Amos. Herm. Fortress Press, 1990.
The overall best commentary on Amos. Though highly technical, Paul's approach makes this commentary still accessible for a wide audience. Most strongly recommended.