Great article from Forbes.com:

…”It’s always been the next big thing around the corner the last 10 years, and now we really feel that it is,” said Brian Levin, chief executive for Liberty Media Corp. (nasdaq: LCAPA - news - people )’s Useful Networks Inc., a company that helps outside developers tap location information from cell carriers.

The research firm eMarketer estimates that U.S. spending in mobile ads, at about $900 million in 2007, will grow more than fivefold to nearly $4.8 billion in 2011. By contrast, paid search and other online spending will only double, to about $42 billion in 2011.”

Interesting thoughts….entire article here