I've said before and I'll say again that I don't understand the utility of Twitter. While I think some people write amusingly on it, I've never seen what makes people so fascinated in it. I doubt I ever will.
Just because something's successful doesn't mean it's useful.
If only all bloggers/comments were as constrained.
But an RSS feed does the same thing already, and is in a format that doesn't make me have to subscribe to yet another site. With feedburner, there's no worry about feed traffic getting out of hand either. So I don't really see the point, except maybe as a marketing tool to the Twitter crowd...
Then again, my startup uses it too (in addition to our blog/RSS), and my business partner really likes it. So maybe I'm just clueless :)
So much data on there for us start-uppers to use for research, marketing, as well as building innovating services using the data. One could create a crowd sourced Rotten Tomatoes-esque site. One example of many what can be done with the data there!