CSS Ratiocinator - A tool that will automatically refactor your CSS
Optimse your CSS. A new take at an old issue.
gradient-scanner
Handy too to pick up a gradient from an image
Prefixr
Generate cross-browser CSS
CSS3 Please! The Cross-Browser CSS3 Rule Generator
You can edit the underlined values in this css file but don't worry about making sure the corresponding values match, that's all done automagically for you.