Kind of expensive ($50.00 a month per domain) but still very cool.

The Boilerplate

Would you like to monitor the performance of the content on your blog/website? Would you like to know how far your content has spread virally through Twitter, which path it took, and who Retweeted it? Do you want to find out which user demographics were interested in your content, which Twitter users were more influential in causing further Retweets, and which Retweets resulted in more Twitter users clicking through to your content?

Companies, brands and agencies are under increasing pressure to provide proof of ROIs when it comes to social media. What the TweetMeme Analytics provide is a way to track the spread of content across Twitter, compare your campaigns with competitor campaigns, and to help improve strategies for future campaigns.

Main Site

http://my.tweetmeme.com/analytics

White Pages

http://my.tweetmeme.com/analytics/whitepaper