Yep, got that on the list, but was thinking more of some kind of fast, speaking-game - like the one where each person says a word that links with the last in some way... only more interesting.
I'm working on a variant of a game called Just a Minute at the moment, which some of the UK BBC Radio4 listeners of this board may have heard of, it involves a player speaking on a given subject for a minute without hestitation, deviation and repitition.
You know, that kinda thing.