From the creators of the fantastic Xyle Scope CSS debugging tool for OSX, comes a fantastic CSS 2.1 Reference. In my opinion this is the best reference available online. It’s very well organized and the interface is very snappy. The value of this is absolutely incredible. If you compare it to the purchase of the CSS textbook, which could be $80, simply having this reference open in a tab within your browser as you code will completely accelerate the process of using and learning CSS for you. So well conceived and executed, you really have to pass this around to other friends and coworkers who use CSS. Unbelievably good.
CSS 2.1 Reference Guide
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