Twitalyzer
Twitalyzer is a tool to analyze your Twitter account. Twitalyzer is integrated with analytics tools to make it easy to track your reach on the web. It will analyze your Twitter account along different dimensions: Influence, Impact, Engagement, Velocity, Generosity, Signal, and 20 others. Twitalyzer knows who is in your social network and where they are, so you can see how good your reach is. Twitalyzer has visualizations to see your progress in reaching out to people