I've never been a fan of ClearType when I was using my old 15inch 1024x768 notebook. The subpixels were just too big for my taste and the positive effect of subpixel rendering got lost for me. Now I've got a new 14inch notebook with a 1400x1050 resolution.
ClearType actually looks fine enough on it for me to give it a try.
The problem is that the new notebook is a TabletPC which means that as soon as I change the screens orientation, the subpixels are in the wrong order and ClearType looks bad. And it doesn't work for vertical orientations.
I don't suppose Windows XP will get an update for this problem, but how about Vista? Will the Vista ClearType be orientation aware? So far I've only tried the Office 2007 Beta 2 and the problem exists there. Is there a way to turn ClearType off in Vista and