An intriguing proposal – a whacky outgrowth of war chalking. Why not create your own bar code containing a URL and stick it as a comment on some location. Then people who happen to be walking by and carrying both a laptop and a bar code scanner can visit your site and read what you have to say.
Of course you could just write the URL itself, but presumably the bar code gives you the chance to encode more information and besides using a bar code is much more appealing to a geek…
