This plugin (widget) creates a QR Code style image depicting the URL of the current blog.

http://www.blog.hemminga.net/plugins/qr_code_plugin/cache/7b7c1f5714f2d0da05719fb2b44a3a53.png

More information on QR Code in [url=http://en.wikipedia.org/wiki/QR_Code]QR Code - Wikipedia[/url]
Download [url=http://sourceforge.net/project/showfiles.php?group_id=160495]qr_code_plugin-0.2[/url]

Have fun