Originally Posted by shake

In this day and age you need to be thinking more than just mobile phones... tablets, desktops and phones. What you are looking for is "responsive" rather than a mobile site. Responsive design will adapt to the screen resolution (even if you just adjust the browser window size). It's much easier to maintain and will work everywhere. Use a template / CMS which is based from twitter bootstrap or zurb foundation as they are the best out there.