Media queries extends the functionality of CSS media types by providing more features and ways of defining the media types. For example, when this specification is finalized you'll be able to define a style sheet for "screen" media types that have a minimum width of 800px. Or define a style sheet for color devices and another for black and white devices.

And the Multi-Column Layout module provides functionality within CSS to create multi-column layouts without a lot of hassle. One of my favorite bits of this module is that you'll be able to define a multi-column layout where the text flows from the first column to the second to the third. All the designer will need to do is specify the columns and put the content in the element. This will make a lot of the current Web layouts obsolete.