Twinfluence - Twitter Influence Analyzer

Twinfluence measures the influence of a Twitter user based on their tweets and respective influence of their followers. The tool uses a mix of social analytics and academic theory by that "ranks" each user by their individual influence.

This blog post looks at the Top Twitterers: http://innovationinsight.com/blog/the-top-twitterers-network...

First I've seen of this.