In XP, when you have ClearType turned on, most ICQ Plus 3 skins have fonts which are completely blurred - exceptions I have noticed to this are Lunar Base and Razor Art's ICQ Plus skins (there are 2 versions of Razor Art's ICQ Plus 3 skin around - 1 is blurry, the other, newer one is not).
My hats go off to those skinners who have fixed this issue already and I implore those who have not to take a look at their skins in XP with ClearType turned on.