Guerilla Game Marketing

GDC is upon us yet again.  Up here in the Bay Area there are already meetups and pre-parties starting (even as the weatherman threatens snow) and production at a thousand different game production studios is at a fevered pitch to get their demos done JUST IN TIME.

Surrounding the GDC every year are dozens of guys and gals handing out flyers, demos, free samples, pitching this product or that.  How many of you indies out there are going to be going "guerilla" with your marketing?  Have you done it before, and what (if you don't mind sharing) are some of your favorite techniques for getting the word out?