One thing I adore on OS X is the clean, crisp typography that it renders. While earlier versions of Windows struggled with this aspect, Win 7 is pretty spot on.
If you’re unhappy with the current way it renders text, you can always tune it up.
Go to Control Panel -> Appearance and Personalization and choose Adjust ClearType text under the Fonts category. The utility that pops up should walk you through setting up text rendering the way you want.