If you've been following the pre-pubs feed, you will have noticed there have been a whole slew of recent pre-pubs with titles like "Studies on <OT book>." These are all between $29.95 and $59.95, with SRPs as much as 10 times the pre-pub price.
Anyway, maybe it was just that I'm still kind of in the April Fools mood, I don't know. But I decided to do a little unscientific study and see which Old Testament book of the Bible is most popular so far. Of course the fact that these have been trickling out at the rate of a few a day so some have been around longer for people to jump in on makes these results not particularly meaningful. And the prices vary too. But it is very interesting that even taking into account price variances and length of time on the pre-pub page, some books have reached 100% much more quickly than others which have been around longer and are cheaper.

Poor Zechariah. Maybe it's because he's so expensive ($59.95).
So what's your favorite book of the OT (or of the whole Bible)? If I could only have five books of the Bible, I'd choose Genesis, Psalms, Ecclesiastes, John, and Revelation.