This summer, I've noticed a LOT more motorcycles, scooters and bicycles on the road. Many Greater Portlanders seem to have responded to higher gas prices by dropping from 4 wheels to two. I'm one of those human-powered commuters, at least when my schedule allows.
One of the appealing features of scooters for many is that they don't require a special license, unlike a motorcycle. Unfortunately, because there's no license test to study for, there's also a shortage of good safety and information for scooter riders.