Having a mobile website really isn't an option and shouldn't be an upsell by web developers these days. We've been working on mobile versions of all of our sites and client sites for months now and it's paying off. On average, we're seeing that greater than 10% of our clients' visitors arrive by mobile device. On Martech Zone, which is optimized for mobile devices, we see over 20% of our traffic coming from a mobile or tablet device!
The mobile Web is a fast-growing online arena. Home to more than 4 billion connected smartphones, statistics show that mobile use will overtake desktop traffic by 2014. This means that no matter what kind of business you run, your audience is on the mobile web, and you should be reaching them.
There is a particular behavior on mobile visits that's quite different from a typical web visitor. Mobile searchers who land on your site are typically visiting your business or researching a purchase that they're going to make. AlchemyViral has put together this incredibly informative infographic on mobile optimization.