Google Analytics (@googleanalytics)
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We track these Twitter stats since July 12, 2009. You can see how many followers Google Analytics lost or gained and what the prediction is for tomorrow or the next 15 days, together with all kinds of other stats like rank compared to all Twitter users, tweets etc.
Why don't you give it a try and compare Google Analytics to yourself ? Or if you are Google Analytics get even more feature rich & up-to-date stats with Premium & Pro Twitter Stats.
Twitter Counter is the #1 Twitter stats site powered by Twitter. It all started in June 12, 2008 and we grew rather rapidly because of our Twitter Counter badge. The badge is a nice small image that shows your visitors how many followers you have on Twitter. Within a year the badge was on many many blogs around the world and we displayed more than 100 million buttons in one month. We track follower stats for over 24 million users now.