Mobify gives you the opportunity to make your webpage well readble on mobile devices, It seems like the thing basically decomposes the dom elements works as an proxy and you can select and edit the dom compoents you would like to have in your mobile version for different clients like iPhone, Nokia, Blackberry, and so on. Pretty similar to what the german company Sevenval does.
Mobify service offers a demo to display how your website will look and includes this explanation:
Mobile in Minutes — Use Mobify to create a fully functional, lightweight version of your site which loads up to 100x faster, looks great on mobile and lives on a URL like m.yoursite.com. Designing mobile views is far more efficient than developing standalone mobile websites or iPhone applications.