A while back I came across some information about the Clear Type technology that is included in Windows XP, but disabled by default. Clear Type adds lines of resolution to font rendering by working with sub-pixel coloring which makes fonts appear smoother and more readable. According to Microsoft this technology has the biggest impact on LCD displays but can marginally improve some CRT displays as well. I have not turned on clear type font rendering on a computer with an LCD display yet so I have not bed of comparison, but I really love the improvement it has made on my CRT!

Microsoft has an online tool for turning on and tuning your clear type fonts available at http://www.microsoft.com/typography/ClearType/tuner/Step1.aspx. They also have a power toy available at http://www.microsoft.com/typography/ClearTypePowerToy.mspx which will install itself as a control panel applet.