I find ClearType amazing, too,
but only at small fonts. If I look at large font sizes, it's not even as good as Windows standard anti-aliasing!

Look for yourselves:
http://home.pfaffenhofen.de/lehmayr/Pictures/cleartype01.png

http://home.pfaffenhofen.de/lehmayr/Pictures/cleartype02.png
http://home.pfaffenhofen.de/lehmayr/Pictures/standard01.png
http://home.pfaffenhofen.de/lehmayr/Pictures/standard02.png

Perhaps you at Microsoft are already aware of this. Is there a way to combine the good parts of both methods?