The annual Experimental Gameplay Sessions is now open for submissions. Selected developers will be invited to give a short presentation on their respective games, prototypes and ideas to an audience during GDC (this coming March 2009).

All submissions should be sent to workshop2009 [a], before February 16th 2009 for consideration. (source)

The Experimental Gameplay web site
GDC 08: Experimental Gameplay Sessions
GDC 08: Nuances of Design