Planetary.. wheel!

This miniature rapid-prototyped bike is basically awesome.  I want one.  But big enough to crash - I mean ride.

For those of you who have wondered what the inside of a 3-speed hub looks like - it looks basically just like this.  Planetary gears they call it, and it's pretty dang nifty.

DIY dynamo lighting

This is awful dang nifty. I love hard drive magnets, and I definitely want one on my bike.