Whats the coolest thing you've seen/done with Arduino?
paulgerhardt: The micrcontroller community today is analogous to the personal computer/homebrew computer clubs in the early 70's - except with more embedded applications.I've written code for one Arduino to run a python script to order pizza when one pushes a button (this used to be on my fridge.)I used Arduinos as the processing, communications, and power modules for an augmented reality/robotics project where virtual balls projected on a dry erase board bounced off robotic devices (like a see-saw) and the devices reacted appropriately.Currently I'm writing a program for the Atmel to query how many days left until YC demo day - and light up a corresponding massive LED display mounted on our wall.You should check out LadyAda's site - most of her modules totally rock - especially the xbee and motor shield stuff. http://adafruit.com/