Rizo's

Here’s a nice list of five popular CSS frameworks and also what you need to get started using them. A Quote from the article:

Main features of good CSS Framework is to 1) rapidly speed up our development time, 2) should have a very small size, 3) have good documentation and tutorials and 4) have clean grid structure. You will need a basic understanding of the CSS framework you are going to use to understand why and how things get solved.