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FWIW, the post titles are 1.1 em, and numbering 0.4em. I didn't want those to be distracting, but still wanted them to be there anyway.

Thanks, I really appreciate the feedback and will think about how to tidy it up.

Here's a little trick if you're going to use em:

BODY {font-size:62.5%}

That makes 1em equal 12px, so 2em is 24px, 1.5em is 18px, etc.

You'll need to do this to get consistency across all browsers. Otherwise 1.1em could be 20px for me but 18px for you.

Here's a post that goes into much more detail: http://www.clagnut.com/blog/348/