I'm just rereading (again) Jacob's book. I love that he has such a strong, sarcastic voice! He adds a totally different perspective on things than Bella (obvs). I really feel like I get to know Jacob better every time I read from his perspective. And, it provides SUCH a contrast to Bella. Bella is always thinking about everyone else and Jacob is really quite self-absorbed. Even when he realizes why Leah joins his pack he still, deep down, would rather be alone.
I, too, love the part where he sees Edward's pain and can acknowledge that there's no way he could ever understand, or feel, that much pain. I think that's the beginning of him understanding (sort of) E's love for B.
And like you said, Brittany, he really has the BEST chapter titles. Much different than Bella's one-word wonders.