Uhm.. not only in windows.. Granted, it's far more serious in windows.
It could be used as a DoS attack against your server, but that's not nearly as troublesome as a security vulnerability.
No huge worries here, keeping an eye on things and ready to react if need be. Doubting anything will happen though. Guessing if some kiddie figures out a way to make this exploit work, you might see some higher-profile sites go down tonight or something for a while. Other than that, oh well. Much better than ANY of the IIS bugs.
-Phil