(Transferred from the wiki by Peter)
When I last saw WindowsXP' feature list I saw something called Cleartype which is a technology to make fonts ultra pretty on LCD displays and I thought... I've heard about that before. What Microsoft call a breakthrought invention is infact an old Apple invention called Sub-pixel sampling and guess what.. X supports it. All you have to do to get this amazing thing is:
1) edit /etc/X11/XftConfig and append this:
2) turn off any font antialiasing you might have enabled in fx. KDE.Code:match edit rgba=rgb
3) restart X
4) it's recommended that you try the following, replace rgb with rgb,bgr, vbgr or vbgr to test which looks best on your LCD scree.