QUOTE (SteveZ @ Mar 19 2009, 09:14 AM)

Is there any central documentation on the names of the css style classes, like ul.cat-nav, so I can experiment with other design things I'd like to do? I see that the theme css is hidden can't be viewed in file manager.
There isn't any specific documentation on the class names and where they apply. This is something we're looking to produce, but it will be a fairly difficult task to do in a good and usable way.
Overll, the classes on elements are named logically by function, making it easy to apply styles to specific pages, types of pages, or sections. I'd recommend viewing the default CSS document from a theme in combination with an HTML inspection plug-in like FireBug or the Web Developer toolbar for FireFox.