Peter Bromberg has created a Silverlight application that can display information from TwitterCount via a binding and Chart controls:
I stumbled on to TwitterCounter.com
recently and like any typical narcissistic geek, I put my username in
there to see their stats on my account. One of the first things I
noticed is the nice chart that shows a timeline of your followers
counts. Being an ex financial consultant, I love charts. The next thing
I noticed is that they have a very easy - to - use API that will return
all this data in XML format, which makes is pretty easy to turn into
objects that can be bound to Silverlight fields, and the series of
chart data can be bound to a Silverlight chart.