While mobile Internet browsing makes up just a relatively small percentage of all Internet browsing, the potential of turning these visitors into customers is much greater.
For example, if somebody is looking up your site on a mobile device, there is a good chance s/he is looking for specific information, such as your location, phone number or something about your business that would be a deciding factor in whether or not to continue to your business.
Case in point: Mobile Meteor has created a mobile site for a children's pottery studio in Brooklyn, The Painted Pot. In the month of December, 2009, 83% of smartphone website visitors came from NYC, compared to 69% of visitors to their PC-targeted web site.
Make it easy for smartphone users to get the info they need so they can continue walking down that street and through your doors.