Email-counting shirt tallies opportunities to enlarge your,
ahem, gadget  Husband-and-wife combo Chris and Madeleine Ball
have created a shirt that'll let you and the rest of the world
know how much email you've got waiting for you when you're away
from your computer.  It works by communicating with your
computer via Bluetooth, with an Arduino Lilypad controller
(powered by a AAA battery) on the shirt figuring out how many
lights to turn on. You know exactly how many emails you have by
adding up all the lights, so if you have two emails it will
light up next to the two, and if you have three it will
illuminate both one and two. If you happen to have 127 emails
waiting for you, you'll see all of the lights on (and have a lot
to do when you get back to your computer).  Check it out in the
video above.