Media query enables multiple CSS files to be used depending on media type. The same site can be rendered differently depending on weather it is an iphone, an ipad or a desktop device
Quite possibly one of the best new features added in CSS3. Add any type of font to your webpage without requiring the user to download it to view it or the use of flash or any other plugin.
Even more control in the background size is allowed then ever before, by allowing size implementations in pixels. Multiple backgrounds can also be applied
It is now possible to turn, spin, move, stretch, and scale different elements.
Easily implement rounder corners in their design elements without the need for corner images.
Easily implement multiple drop shadows on box elements.