Looks it got pulled in the meantime. Oops. Looking at it now it says in light gray letters at the top "for docomo" so maybe it was some kind of beta that I accidentally downloaded.

Here's a link to author's blog - there are examples of using zxing library for generating the QRCode. HTH.

http://d.hatena.ne.jp/tomorrowkey/searchdiary?word=*[qrcode]

Install "Barcode Scanner" (available in the default android market). Open a contact (I am listed in my own contacts list), hit menu, select share, select Barcode Scanner, see a QR code on your screen that someone else can scan.