CSS Templates
Pre-made CSS templates can provide a quick way to construct a web page layout. The settings can be tweaked as necessary, but it is recommended to read the commented code carefully. Many templates give … precise and helpful guidance.
http://www.freecsstemplates.org/css-templates/1
http://www.free-css-templates.com/ (clean designs)
http://www.freewebtemplates.com/ (not just CSS, many templates for inspiration if not the code)
http://www.dynamicdrive.com/style/layouts/
http://www.dynamicdrive.com/style/blog/entry/css-equal-columns-height-script/ (un-tested, but might be worth a try)