Feature Request - Extract Class refactoring

It appears that ReSharper 2.0 doesn't have "Extract Class" refactoring from existing class.
Martin Fowler's refactoring book says, "You have one class doing work that should be done by two" as "Extract Class" refactoring and I'm sure there are many cases where this refactoring is needed.
I don't know why this refactoring is missing.
Is this difficult to implement?

Regards,
Terry