is it not for webmasters to add the whats related function to their websites as well - the re-testing would be refining it for content analysis using current algos etc.
Also carrying out other tests as well associated with implementing it.
abacuss
9:10 am on May 15, 2006 (gmt 0)
Probably this has been done to give the best related results for a particular query set. Related sites may be a technique that google wants users to test them and probably use them in their site.