When it comes to the "Are bicycle helmets a cool look to rock (sensible too!) or are they for weirdos?" qustion, the ESP camp is divided in two. This bike helmet by Luke pannel of Brunel University should keep both teams happy.
"It features a filtering "shield" over the mouth and nose, which cuts particles and dust, then expels them through a plastic tube when the user exhales. The helmet isn't currently in production, but the designer hopes to find a manufacturer, then market the device for around £100. Now all it needs is an attached Bluetooth headset so you can communicate back to the Death Star without taking your eyes off the road."
-Joshua Topolsky @ Engadget