won't get caught again - again

We run a Windows Media Services 9 hosting service across a couple of machines using the Network Load Balancing facility inherent in Windows Server 2003 Enterprise edition: works like a dream. We recently had to rebuild one of the machines following a problem with the RAID controller and yet again I clean forgot to remove the default Authentication and Authorisation settings for the WM service to match those used in the other cluster host. I then spent several hours banging my head on Active Directory and NTFS permissions trying to figure why this host was serving OK from some publishing points and not others before a I realised the error of my ways. A "salutary experience" as they say!