I might not be the most appropriate advocate for helmet use. I sometimes ride with a friend who assesses brain injuries, and she has accused me of being a few tacos shy of a combination plate.
Still, I've bounced my head off everything from Moab slickrock to Anchorage ice enough times to believe in the benefits of encasing one's skull in reinforced Styrofoam. So I was pretty jazzed when a packet of stickers arrived from the folks at the Safety is Sexy Campaign in Washington, D.C. (My Alaska friends may now commence ta askin' fer 'em as long as supplies last.)
Helmets work. And these stickers are cool. Check out the site and fire off an e-mail to request some stickers. They're free, but it's a nonprofit operation, so it wouldn't hurt to send a few bucks to help them cover the cost.