There's no need to declare this "the year of mobile." If anything, last year was the year of mobile in terms of the growth in both mobile usage and the availability of mobile sites and apps. Now, however, it's time to redesign your mobile site, because your existing version is probably far below users' growing expectations for user experience quality.

The mainstream Web's history repeats itself here. In the beginning, the Web was experimental — accordingly, it was acceptable to have a somewhat shaky, experimental website. Many sites were crippled by misguided design advice, which was common in the early years, and most companies didn't know any better (because they didn't do usability studies). Now, people simply expect websites to work.

Same with mobile. Last year, it might have been cool simply to have an app. Now, that app better be good. Requirements have gone up. Luckily, our new research shows that mobile sites and apps have been improving their usability, even though it's still far below that of regular websites accessed from a desktop computer.

• Have a separate mobile site, don't try to make your desktop site work on mobiles
• Forget about feature phones (yep you heard that right!) 
• While a (good) mobile site works, a (good) mobile app works even better. Apps - Sites: 1-0
• Don't design for big screens
• Remember people's fingers need to be able to 'click' your UI elements
• Limit the features available on your mobile to the ones most useful for mobile users. Don't include everything.