Minify your CSS
Online CSS Minifier/Compressor. Free! Provides an API. Simple Quick and Fast.
Written and hosted by Andrew Chilton (@andychilton).
Sublime Text 2 Plugin
Thomas Lété has made a Minifier plugin for Sublime Text 2. Thanks Thomas.
Krusader File Manager
Jon Toffy made a plugin for the Krusader File Manager
Tony Almeida made a PHP Library - PHP-JS-CSS-Minifier- to help minify both CSS and JS files in your PHP projects. Thanks Tony!
Click on the language of your choice:
I'd love to add more examples in your favourite programming language, so feel free to send them my way.
Email andychilton at that gmail place in the sky or tweet to me @andychilton.