Jared at Thinklings has a good post up about the implicit humor in the Book of Habakkuk, as well as an exploration of Habakkuk's example of faith:
I'm trying to be humorous with that nutshell summation, and Habakkuk's faith is actually remarkable in that he continues to faithfully acknowledge God's goodness and holiness and righteousness even in the expectation of pain and suffering, but that is really the gist. God has an agenda, and it is not ours.
I've long treasured the third chapter of Habakkuk as one of the hidden gems of Scripture. It takes quite a bit of unpacking homiletically, but it is a very powerful expression of faith in the midst of disaster.