I just got my arduino kit in the mail yesterday from the free day (also known as break my f5 key day).  I stayed up all night toying with some infrared lights.  I removed the infrared sensor from my craptacular logitech webcam and the fun began.<p>The first thing I noticed from hooking up a few hundred ir leds (best $5 spent on ebay) was the heat the board was producing.  This makes me consider dusting off the nerd kit and hooking up the TX/RX to the nerd kit and have 1/4 of the leds on the nerd kit and some of the data processing working there.<p>My end goal is to make a tablet, but right now I'm just toying with a desk sized white board.