I haven't tested it yet but this looks cool!
Clean CSS - A Resource for Web Designers - Optmize and Format your CSS: "CSS Formatter and Optimiser
(based on csstidy 1.1)
Language: English Deutsch French
Important Notes:
* the same selectors and properties are automatically merged
* your code should be well-formed. This is no validator which points out errors in your CSS code. To make sure that your code is valid, use the W3C Validator."
