Well apparently it doesn't work that one in etc and from my experence it doesn't.
Its in there but if you then try and ping the address it still goes to the dns server and as my local dns server seems to spend more time down than up and there is a bad route to the one I usually use.
Its quite well documented on the web it doesn't do anything.
Normally I would agree with you Mike but its just an entry with pprune and my mail server for when the local DNS server isn't playing ball and there is no route to the one I usually use.
The administrator account though Its very useful to know about. I know its done to protect the user but it makes life so much easier when you use it instead of that sudo account.