Here are some useful tips to help organize and make your CSS files more usable to you and anyone else who works on them after you. I don’t agree with #3 and #4 is likely for large websites, but the rest of the list is very useful. Like this one:

6) Place color scheme in one place for refrence.
Before you start your CSS file, comment your common colors and add it to the top of your style sheet. This will save you ton of time and will insure that your site has one color scheme.