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Good list! A few caveats, though:
#2: "Prevent oversized content to break fixed width floated layouts": be careful of using overflow:hidden, *especially* when you have unknown content. It's extremely irritating to have some important text cut off with no scrollbar even to access it, and I see that a surprising amount in CSS-based sites. Ruining the content is worse than breaking layout, even though you don't want either one.

In some cases overflow:auto is a good solution. It'll show a scrollbar if the content doesn't fit in the block.

#8: "Remove active link borders": I don't recommend this one. First, it only works in FF. Second, those dotted line link highlights are important for accessibility -- don't break them.