Mobile commerce is not desktop 2.0, and your mobile website or app is not merely a shrunken-down version of your e-store. Mobile is its own animal, with its own use context and utility.
Mobile devices have 5 native features that ecommerce marketers and developers can embrace to augment the smartphone or tablet experience: voice, accelerometer, camera, GPS and device pairing. How are (and could) retailers leveraging them to boost mobile experience?
Any mobile commerce site can be searched by voice simply by leveraging the microphone built into the mobile OS, which translates it to text for the user. No special programming required by the merchant.