Here an interesting post from Tommi about 2D bar codes. Seems that 2D bar code are not so popular in the western world and I am really puzzled about it. First, they are easy to use and from a user point of view are really attractive. You get the curiosity of knowing what is!
OEM should integrate the readers in every phones and content providers should use them. You can check the Nokia Beta Lab for the reader and to generate a 2D code.
Here is mine for this blog:
For example MOSH should use them to allow people a direct content download to the phone.