From Make's Matt Mets: "Aaron Alai designed this kicking electronic business card, which demonstrates how transistor amplifiers work. When you touch two electrodes on it, a small amount of current is conducted through your body, which is then amplified by a transistor to light an LED. I like the clean design, which is both functional and descriptive of how it works."
Aaron calls it a "small interactive exhibit" in business-card form. I've always had a passion for great cards -- this one is a cake-taker. I stand in awe.
Business Card / Transistor Amplification (Thanks, Eric!)