"With the libraries we create, we try to make the exceptions that a library client receives meaningful."
so you create custom exceptions....I bet just like I said below. ".. so that the client knows that they are catching all meaningful application exceptions:" The client knows of all exception if the catch them like they should and it should be their responsibility to log them if they feel the need to, otherwise you are eating up their harddrive space for no reason. You can read messages from the DOTNET archive, unsubscribe from DOTNET, or subscribe to other DevelopMentor lists at http://discuss.develop.com.
