In this article, on SEOMOZ, the blogger takes a stance that is slightly cynical with regard to mobile marketing. He thinks that mobile marketing is important, but that there isn't really a need to create a completely different mobile version of your website to be effective.
Furthermore, he says that the types of searches on mobile are very similar to those run on laptops or desktop computers-- usually local searches.
Here's the article on this week's theme of Mobile Marketing:
http://www.seomoz.org/blog/whats-the-future-of-mobile-search-and-seo
A few questions to ponder via this blog:
1- Do you agree with the author that most companies don't need to spend money or time in creating a mobile version of their site?
2- Why/why not?
3- Do you think that web searches on mobile devices are as similar to desktop searches, based on your personal experience?