Marval - 10:04 pm on Feb 11, 2005 (gmt 0)
walkman LOL - the beer for breakfast would actually be a good idea. Seriously though, with Google recently becoming a registrar, and all companies that do kid-safe and other types of spam protection already being used by Google, I dont think its a far reach to just start using that database (heck they already use chilling effects for DMCA publication)
That tied to the recent trojan bots that brought the search engine grinding down looking for email addys to use for spam, might be enough to trigger something like this.
Again - I can see other factors that would cause loss of rankings on these other sites that also have yet to be proven like Googles change in their handling of aliases/stacked domains etc. splitting sites into many pieces, but it was just a common factor on every domain I looked at for others.