I found this really interesting article of at NetTuts+ about some really useful CSS selectors we never got around to that can come in handy. The first are simple, but they get interesing when they get down to things like ul + li and ul ~ li. X[href="foo"] is a pretty interesting one too. Worth checking out if you're still interested in some very basic CSS web design techniques. If anyone is still checking the Web 3 site.
Here's the link