Actually it's the other way. ClearType is off on my PC. If I turn it on, I get better results in non-IE browsers on the websites that were ugly, but the Windows itself is worse, including app menus, etc. What is more and in contrary to sites I used as a reference, for example, Webmaster World looks worse with ClearType on.
I still wonder what's the deal with this and why things cannot be unified for the better user experience. How many people actually will go through ClearType setup in control panel and spend their eyes on "which one looks better?" especially when they get 4 or 6 choices.