2D barcode scanning on your mobile...
 

Don't know why anybody would want to do this, but it's pretty cool...

Link

Didn't even know that the Java app existed. :)

Re: 2D barcode scanning on your mobile...
 

I've seen this before, I think it was on "Click", they were using it for advertising posters in London.

The posters made no sense unless you photographed them with your phone, and had the relevant software on your mobile.