I’ve been working on understanding CSS in flex better as i’m adding a style explorer to my company’s software to allow our clients to do their own branding. Couple of links i found useful:

http://viconflex.blogspot.com/2007/04/flex-modules-compile-and-run-time-css.html

http://blog.kevinhoyt.org/2006/06/01/css-positioning-with-flex-2/

http://blog.kevinhoyt.org/2006/02/03/programmatic-skinning-with-flex-2

http://examples.adobe.com/flex2/consulting/styleexplorer/Flex2StyleExplorer.html

And since i need to load the css at runtime instead of compiling it in the app:

http://www.rubenswieringa.com/blog/cssloader