We prefer readability over file-size savings when it comes to maintaining existing files. Plenty of whitespace is encouraged, along with ASCII art, where appropriate.
At least 45% of my development time is spent "drawing" barely comprehensible postman's hats in ASCII in the CSS files. I think in future I will just copy and paste.
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Didn't know this actually, though it's in Eric Meyer's CSS reset that I use.
Additionally, unit-less line-height is preferred because it does not inherit a percentage value of its parent element, but instead is based on a multiplier of the font-size.
Nice link.
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