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This is a website intended to demo the capabilities of Windows Azure storage, web roles and worker roles. There is an associated blog post at http://blogs.conchango.com/jamiethomson/archive/2009/05/06/tweetpoll-my-first-windows-azure-application-is-live.aspx which explains all and which, if you are reading this, you have probably already read immediately prior to coming here but if not let me tell you what the graph below represents.
An Azure worker role is responsible for polling Twitter's public timeline (http://twitter.com/statuses/public_timeline.atom) periodically and placing each returned tweet onto an Azure queue. Another thread in that worker role continually picks off a message from the head of the queue, determines the length of the tweet and increments a counter stored in an Azure table. There is a counter for each possible tweet length (1 to 140)
The graph below is generated inside an Azure web role by querying the aforementioned Azure table and thus visualising all of the counters. It shows the distribution of lengths of tweets based on a sample set