Picked up on this from one of the MS UK teams blog http://blogs.technet.com/eileen_brown/archive/2007/10/09/communicator-mobile-2007.aspx

Essentially a 3D barcode and app software for mobile devices with cameras. 

Heres the barcode generator http://reader.kaywa.com/ and mobile device reader code http://www.quickmark.com.tw/En/basic/download.asp

Not sure of uses but like the idea of ‘tagging’ objects – posters, ad’s, screens etc