We had this at Be2Camp north last week.. it felt much more dynamic and lively than any of the other twitter visualisations I've seen so far. Thought that people here might want to be aware of it, particularly if you organise events with a twitter backchannel display.

Here's a currently trending term to see what it looks like when there are a lot of tweets on a topic:

http://visibletweets.com/#query=%23Britflicks&animation=...