I know this is an old feature but I can't tell you the number of times I've been looking at the screen of a colleague, customer or friends' LCD/laptop screen and they aren't using font smoothing technology built into Windows XP - ClearType. It happened to me again today. This feature sharpens and enhances your on-screen fonts.
To enable it and see pretty, smooth fonts that really do improve readability, do this:
I don't know why it's not on by default or hidden so deep inside the UI. A simple, effective and seemingly overlooked feature of XP. Tell all your friends.
You can send them this link for instructions on how to enable it.
You can tune the rendering using this web based tuner (must have >= Windows XP SP1)