Update: Attention has been paid! Please see the comments for a nice response from a WorldCat representative. We now have an answer to the title question: Yes.
My beloved university library has now switched over from an in-house computerized catalogue to using WorldCat. There are definite advantages to this, and some neat things WorldCat can do.
But for all its many useful features, I wonder: Does anybody at WorldCat actually use libraries?
