This year, prospective students of the class of 2016 will be able to solder up and take home a cute USB gadget at the Next Make event:
The board plugs into a usb port and pretends to be a usb keyboard - it can then "type" a message into the computer it's plugged into, without having to install any drivers (inspired by an Instructable USB PCB business card that types out a guy's resume). You can program any message you want into it (up to about 1000 characters). Here's a video of it in action:
The board is based on the ATTiny45 with V-USB (software USB library) which lets the device show up as a low speed USB device. If I have some free time, I may program alternate firmware that emulates a USB mouse and sends random mouse movements at random intervals as a prank device like ThinkGeek's Phantom Keystroker.
The PCB designs are on github: https://github.com/scottbez1/nextmake-cpw2012
Looking forward to CPW!