Chris and Madeleine Ball created a t-shirt which incorporates an Arduino Lilypad, Bluetooth dongle, and an Android phone to send the number of unread emails in their inbox to the shirt, which will show up as illuminated LEDs via conductive threads. The shirt has 7 LEDs and can display up to 127 new messages. For most of us, 126 of those will be spam.
If you want to try and make one of your own, check out the project page to obtain the source code that runs on the Lilypad and the python script.
If you’ve ever wanted to know how email travels from your modem to your laptop, here’s a diagram that puts everything into perspective. First, the modem receives the incoming mail message, and then the message transforms into a paper airplane that travels to your laptop while generating a blank voice bubble halfway through the ride. Once received by your computer, you will be alerted to the fact that you have mail when your computer poops out an envelope. If you explain the process to your tech-savvy friends this way, you may get a “wow” out of them, but it will most likely be followed by an uncomfortable “…”, not “!!!”.