TwitCharts uses the API to help you build Google Charts and then sends a bit.ly link out as a tweet for you pointing back to the chart itself. Just enter the numbers and what you wish to show and off the site goes. It was a clean UI, very simple to use but did require …
Another cool little tool to track and see your twittering habit can be found at Twitter Charts. It uses a mashup of your public stream through Yahoo Pipes and into a graph from Google. Simple, yet quick. Just enter your Twitter id and off it goes.