"The criteria by which sites are judged change frequently - a site may appear in a top 10 position one day and in the 45th position the next. Then, it will appear back in that top 10 position on another day." - that is something that could be read in any SEO forum about Google in the last few months.

In fact, I found that gem while reviewing some of the newsletters I used to send out. This appeared in the November 5, 1998 issue and was referring to the #1 search engine of the day - AltaVista.

Everything old is new again:)