Here's a new trick that hasn't been blogged yet! Google's url shortener at goo.gl can generate QR codes (which are 2D barcodes) just by appending ".qr" after the goo.gl url. So the url http://goo.gl/727X does a redirect to http://www.mattcutts.com/blog/ and the url http://goo.gl/727X.qr will generate a QR code that also goes to http://www.mattcutts.com/blog/ . Pretty cool, huh? Please share this t