Was wondering how our little app could see 100 fold increase in uniques just overnight. Simple reason: Google changing logo to depict an ITF bar code - tons of people going to wikipedia articles on bar codes. We have some referral links originating from wikipedia (mostly submitted images of EAN and UPC bar codes).
Too bad the bar code logo will go away - these are our Andy Warhol threw a "15 Minutes of Fame".
http://barcoderobot.com