BTW the MathPages indeed have some of the most thoughtful commentary on relativity available on the internet The author of the MathPages is an executive of a major corporation and prizes his anonymity Back a few years ago when I was helping Don Koks find a backup editor for the Usenet Physics FAQ httpmathucreduhomebaezphysics  I was able to do a whois on the site to identify the owner and unsuccessfully tried to recruit him for FAQ duties Shortly afterwards it no longer was possible to get any useful whois information