Frank Zhao put together a USB business card. It’s even got the instructions printed right on the silk screen of the PCB explaining how it should be used. It’s based on an AVR ATtiny85 microcontroller that runs the V-USB package which handles USB identification and communication protocols. The rest of the hardware is pretty standard, the uC draws power from the 5V USB rail, with a couple of 3.6V Zener diodes to drop the two data lines down to the proper level.
Once plugged in it waits until it detects three caps lock keypresses in a row, then spews a string of its own keypresses that type out Frank’s contact information in a text editor window (video after the break). It’s not as reusable as the mass storage business card because Frank didn’t breakout the pins on controller. Here arlayoe some more business cards that make you stand out.