TOTD rather likes not only the graphs that this will provide for a Twitter account, but also a tagcloud:
You might also want to check out:
http://twittercounter.com/
http://twitteranalyzer.com/
which do similar things although there are more. This lists several other analytics tools:
http://www.socialmediatoday.com/SMC/165191
But let us know if you have any favourites.
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