There is an interesting article I ran across about mobile advertising trends:

 http://searchengineland.com/071210-092619.php

They are projecting 5 billion in mobile advertising revenues by 2012 in North America and Europe.  This should be incorporated in Australian strategic planning for the near future to ensure companies are positioned in this market.

It is important to note how some of the major players such as Yahoo, AOL, Google, and MSN are positioning themselves and aligning with exclusive media partner deals to ensure market share.