Alternate & augment reality
If you think mobile devices are just simply for communication check out these videos:
http://www.youtube.com/watch?v=Te9gj22M_aU
http://www.youtube.com/watch?v=2V6MNp_tWG0&feature=channel
http://www.youtube.com/watch?v=b64_16K2e08&feature=related
What you’re seeing is the baby steps of what is possible from smartphones: making your enviroment the content.
Imagine the implications.
If not now, then when? 