Via Lifehacker:

That, my friends, is a ’QR code’ generated by this site. All this one encodes is the URL ‘fnord.phfactor.net’. You can also make one with text, phone number or SMS (text message.)

On the iPhone, I’m using the QuickMark app to decode ‘em, which seems to work pretty well and also does old-school barcodes.

Pointless? Check this usage out, and be sure and watch the linked video.

There are some other uses as well. You’ve got roughly 7KB of data, depending on encoding and error correction. Amazing times we live in, eh?