Really not a whole lot in the Bible is Chronological. The story of Job is believed by most to have occurred before the story of Abraham. Most of the minor and major prophets were written during the books of 1 and 2 Kings. Even the if you take the whole grouping of prophets as a section aren't in chronological order to each other. The epistles aren't arranged in chronological order either.
I personally believe Revelation was the last book written, and I have some evidence for believing this, but then again I wasn't there with John on Patmos to know exactly when his book was written in regards to the others. However chronology aside a believe it is placed last when all the canonical books were arranged because of its content. The book is mostly prophecy of things that haven't happened yet. So if you are looking at the New Testament as far as subject matter goes it makes more logical sense to our western minds to have it arranged with Jesus, then what the disciples did in Acts, the letters to the churches, and then what things are going to happen that haven't happened yet.