Twitonomy is a Twitter analytics and monitoring tool.  Monitor your own account or any other Twitter user, as well as lists and keyword searches.  Your profile page will show tweets per day, total links shared, mentions of you in others tweets, the hashtags you use the most, tweets of yours retweeted the most and so much more (and that’s the free version).  The free version is amazingly robust and sufficient for most, though marketers and brands may want the added features of the paid version.   Twitonomy