Now, this is a good idea.

This could also be done as a seperate website layout:

I think it'd be great to rank twitter users based on criteria: How influential are they? What category best fits them in one word? And statistics: What % of tweets have text, links, images? Filtering by media type.

I'd also see this as a very useful tool to pay for. If nothing else by ad revenue on the website itself.

Edit: Actually I think http://www.twitonomy.com/ or http://bottlenose.com/ are pretty nice.