Those of you who know me probably know I've been working on a long-board that uses an Atmel microcontroller and a hall-sensor to monitor the skateboard's speed and then convert the speed info into color changes for under-board halo lighting.
The skateboard also has headlights and tail-lights that come on when the processor detects the board is slowing down.
Most of the internals for the 1.0 version are complete, but I'm waiting on Sugru to finish scaling up production on their awesome looking hacking putty. (sugru.com)
If I get too impatient, I may resort to epoxy putty, but Sugru would be so much better for waterproofing the enclosure, etc..