Besides the laying out and styling of individual elements, different CSS properties can be lumped into different combinations that allow for all sorts of different things, including: Rounded Corners, Ratings Systems, styling lists, print-specific sheets, badges, buttons, and most everything else you could think of. A very comprehensive list of different CSS Tricks and Advanced Techniques can be found at:
http://www.petefreitag.com/item/475.cfm
After assembling your first CSS based site, take the time to look at the actual code (either in Dreamweaver or any text editor) and learn what the programs are generating, which properties their manipulating, and the order in which things are laid out.
