Many of you may already know this sites. But one more link can not be that bad.
If you are searching for a list of CSS Attributes and their compatibility in the major browsers with examples, demos, hacks or workarounds to get it working Cross Browser wide take a look at http://www.quirksmode.org/css/contents.html and http://de.selfhtml.org/navigation/syntax.htm#css (only in german language at the moment).
