OK, I've heard of wearing your heart on your sleeve but broadcasting the amount of e-mail in your inbox on your shirt? That's what Chris Ball does.
Chris Ball is a free software developer who lives in Boston and works as Lead Software Engineer for One Laptop Per Child. On a recent free day he got some free electronics to mess with and came up with his new shirt. He made a t-shirt that displays how much unread e-mail he has using an Arduino Lilypad and Bluetooth dongle. An Android phone sends the number of unread mails to the shirt.
Of course, until I clean out my in-box, the shirt will be useless to me as I will quickly surpass the 128 message limit.