I’d love to see a chaptering feature in Twitter. Take your tweets and assign them to a chapter. Think of it as hashing, just without everyone else’s crap. Then they could take it one step forward and allow you to fold the chapters into a Tweet Book.
For example, I have all kinds of great one liners about online marketing, advertising, and business practices. My twitterea runs rampant sometimes, and I lose track of some of the related tweets. I’d love to be able to better manage my tweets so that I could quickly point someone to my words of wisdom. Plus, it would give me some good daily affirmations.