This has to be one of the niftiest ideas I've ever seen for bikes.
Byron Loibl, a graduate from the Cleveland Institute of Art, has created a light that simulates a bike lane line two feet to the left of you. You strap in on the back of you bike (well, you install it) and it creates a line that motorists can see and use to figure out how far away from you to stay and be safe.
Simple, but brilliant. My only questions are how well it shows up during the day and how it's powered...but this is an every-little-bit-helps moment here.