Found these really cool CSS tools. Check out the second link. Very helpful if you want to optimize and clean up your CSS after a project.

• Em Calculator estimates Em size equivalent to px size. Could become useful since more standardistas are adpoting use of Em sizing (vs. px sizing) to define the max width of their layout, a technique which I intend to investigate more thoroughly.
• CSS Formater
• Clean CSS — yet another CSS cleaner/optimizer.
• CSS Tweak — another CSS optimizer from cssdev.com
• westciv’s complete CSS guide
• MODI — Another amazing bookmarklet from Slayer Office. MODI is a mouse-over DOM inspector.
• W3C CSS Validator
• I Like Your Color via Red Alt — Type in the URL and it grabs the interface colors and display them in hex. Freakin’ Awsome!
• XHTML Semantic Generator — The XHTML Semantic Generator is a system designed to help developers prototype and test URL’s to ensure they contain basic accessibility and usability features present in modern web technologies, and to automatically implement them if possible.
• Special Characters List via manicalrage.net
• Online CSS Optimizer
• 4096 Color Wheel
• ColorCombos — Yet another online color pallet tool.
• COLORlovers — nice collection of user-picked colors & palettes with hex code.
• Weelstyled.com’s color scheme generator
• CSS Hacks Browser Support Chart
• CSS Compressor — squeeze the snot of that CSS.