Yesterday I was discussing QR codes, and the possibility of turning the actual text in magazines or on posters into links. I see no reason why in the very near future you couldn’t go to a Web page, video or other online resource simply by pointing a phone at a printed URL. These methods could help revive the flagging newspaper and magazine industries, by introducing a much greater integration between the printed page and the Internet. For example you could easily share a magazine article with Facebook friends.
An idea that I can see supplanting even this though is a form of steganography – that is, encoding links and other data into pictures, in such a way that they can be read by machine without being visible to humans. Actually this is already used for anti-forgery systems; Adobe Photoshop for example will refuse to handle scans of Euro notes because it recognizes a pattern hidden in the design. The same method could turn photographs into clickable links when you look at them through your phone.
And print designers will absolutely love this. Not only do they not require blocky codes or funny fonts, they can make tired elements like www and .com finally vanish from their pages. So these I think will be with us pretty soon. Until they’re eventually replaced by RFID ink.