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 http://math.ucr.edu/home/baez/physics/ , 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...