David DeSilva's commentary on Hebrews, Perseverance in Gratitude is so good I can hardly stand it. I've been telling my wife about it al week. Not only does he write well, not only does he interact with all the major scholars, not only does he have a good knowledge of classical literature which he brings to bear, but he also has thoughtful things to say about how we might go about appropriating and applying the teachings of Hebrews to life today.

His section on the warning of Heb 6 was just outstanding, and certainly the most sensible thing I've seen to date. I may share a bit of this later. Let's just say for now that a good knowledge of social institutions of the 1st century adds a LOT to reading Hebrews.