For those who like to bike at night, all those dim headlights, taillights and reflector taping are pretty mediocre compared to this. If I were still biking about at night, I think I would want these - RevoLights.
http://vimeo.com/27280439
Richard :munchin
Interesting but......
Lots of bright lighting and good side visability.
When riding a bike at night you not only want to be seen but you want to see forward. Bike tires don't do so well over broken glass or other road trash. So you'll also need a good front light.
And if you're riding your bike correctly you'll get traffic coming up behind you - so you'll need a good set of rear lights.
And a friend of mine who rides a bike a lot in the city recommends a loud whistle.