Joel on the new CueCat.
Hmmmm ... ok, except that at some point taking photos with a phone is going to be easier than typing in a URL ... if not today, then sometime t in the future. And at that moment, this kind of thing starts to make sense. And actually I´m pretty sure I read about these things already being used in Japan.
Also, bar-codes (2D or otherwise) are still ways of giving ids to things, whose importance is only increasing, even if we eventually move on to RFIDs.