Twitter - Analysing the collective voice

In an earlier post I talked about analysing text content with Tagul, which is an alternative to Wordle

I recently presented this presentation on using twitter to analyse what your students pick up in your lectures in real time using twitter.

Twitter - Analysing the Collective Voice on Prezi

Since then, I've discovered a site that can do this automatically at eduserve - http://summarizr.labs.eduserv.org.uk/