The nearest thing to a "design pattern" in CSS are common layouts. The best tool for taking advantage of common layouts, column widths, etc. is 960 grid system, at 960.gs
Watch this screencast for a brief intro. It saves a ton of time, and helps you apply all the common layout patterns with minimal code:
http://net.tutsplus.com/videos/screencasts/a-detailed-look-at-the-960-css-framework/
All you have to do is to apply the proper classes and do a little arithmetic to make sure all the column widths add up.
The one book that I recommend the most for CSS is CSS Mastery by Andy Budd (cssmastery.com). It is somewhat small, but it has helped me more than any other CSS book.
