The Experimental Gameplay Sessions occur every year at the GDC; it’s a two-hour showcase of unusual and cutting-edge game designs. Each designer gives a ten- or fifteen-minute presentation of each game, including a live demo.
We’re now looking for submissions for the 2009 workshop, which will be happening in March. If you make unconventional kinds of games, I encourage you to apply. Our Call for Submissions document discusses everything in more detail:
Also, here’s the main page, for those who are just generally curious about the event.