Twtbase. I never did find the tool I was looking for, but I did find a lot of other neat Twitter applications on Twtbase. One of the Twitter applications on Twtbase that I like a lot is Trends Map.
Trends Map is an application that displays trending topics on Twitter according to location. In other words you can visit the map to see what topics are currently the most discussed topics in a city, state, province (yes, I'm in Canada this week so I thought I should list that option), or country. Embedded below is a Screencast of Trends Map that I found on Twtbase.
Applications for Education
If you're looking for way to reuse or analyze information from Twitter, take a look at Twtbase. Trends Map could be a good introduction to a lesson on current global events. Have students investigate why a particular topic is trending in one area but not in another.