I got Spokelits, and I'm giving these as Christmas presents, they're great -- come in a variety of colors, and make you very, very visible from the side. I jumped on them after I ALMOST turned into a rider -- dark bike, dark clothes, dark but busy road, rider had front and rear lights, good ones, but couldn't be seen at all square on from the side.
Spokelits have a steady and a blinky setting. And they cost $10 at my absolutely wonderful LBS