Strings and IsNullOrEmpty

Jesse aks:

>Tired of doing this: "if(s == null || s == String.Empty)"...

Yea, we have heard that request before... here is a method we are looking at
adding a the Whidbey release of the .NET Framework on the System.String
class. 

public
static bool IsNullOrEmpty(string str)

what do you think?