Recently Adobe released a new product called “Adobe Shadow”. Adobe Shadow enables the web developer who is developing for multiple devices to view changes live simultaneously on as many other devices as they wish. As you test on PC you get live updates of the look and feel on all devices hooked up to your computer via wireless.
One Drawback which I am sure they will fix in time is that Adobe Shadow only works for iPhone iPad and Android devices. This does cover the majority of mobile devices so is still well worth the look.
Adobe Shadow is currently free to download and use because it is still in testing stages.