Windows XP doesn't have it on by default. Most users don't know how to change it, even if they know what font-smoothing is in the first place. We as web develo

Windows XP doesn't have it on by default. Most users don't know how to change it, even if they know what font-smoothing is in the first place. We as web developers need to at least be aware of what our sites will look like for a given percentage of our userbase (and make a decision as to whether it's worth making it look good for that percentage).