For the past 4 months or so, I’ve been a big fan of the form JTS Brown. It’s a crazy, awesome, form that basically follows the philosophy that everything is a gift and everything your fellow players say and do is golden. The original group rehearsed it like a play and ran it for a few months (like a play). Here is an interview with Craig Cackowski, writer for “The Colbert Report”, costar of many Sonic commercials, and one of the original members of JTS Brown explaining what it’s all about and how you play it.
http://www.improvinterviews.com/2006/11/jts-brown-description-by-craig.html