Other than Linq to SQL does anything else consume INotifyPropertyChanging?

Question

Having never used INotifyPropertyChanging i was wondering if anything other than Linq to SQL uses it?

And if Linq to SQL is the only user why does INotifyPropertyChanging exist in System.ComponentModel?

http://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanging.aspx