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Russ at Maxdesign has written an excellent new article called Colored boxes. The article gives you a nice step-by-step outline that can be applied to many different web layouts.
Oooh! Check this out! (thanks to CSS Vault). Awesome little tutorial that combines the “Sliding Doors” and “whatever:hover” techniques to create a cross-browser CSS tab effect with rollovers. Neat stuff! Read the article, there are great resources linked there as well.
Hosted by the U of MN, here is a HUGE list of references to good CSS information. I present, Web Design References: Cascading Style Sheets.