I think that one of the biggest questions could be is it yet worth the effort to cater to mobile users. While there are some sites that will absolutely benefit from it, there is by far many more that would not even know they can access websites through their mobile.
For example at this point to my knowledge only one of the banks in Australia has made any effort to cater to mobile users, and aligned it nicely with the launch of the Iphone 3G in Australia. Not that i think people who bought the iPhone are going to go running out to change banks because of it.
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