Independent Consultant (Toronto, Canada) specializing in Lucene, Hadoop, HBase, Nutch, SOLR, LingPipe, GATE, Data Mining, Search Engines, WebLogic, Oracle, Liferay Portal, Java, J2EE, SOA, and more.
Master in MATH, Moscow State University n.a.Lomonosov
Supplemental Index: it could be new staff for Google and some of satellite-SEOs, although Google tries to implement it properly since June 2002 at least.
Supplemental Index is well known since... June 2000, Inktomi: http://searchenginewatch.com/showPage.html?page=2162651
Later article (Danny Sullivan):http://searchenginewatch.com/showPage.html?page=3071371
And finally this page, open-air discussion without any technical understandings:http://www.mattcutts.com/blog/google-hell/
Just as a sample, initial versions of Google Sitemaps said that it is for webmasters who wants to submit form-based/form-submission-generated dynamic URLs to Google, which Google can't find by regular way from anchor links etc. And it failed. Google has even new rule "to restrict results pages", see another blog page.
It looks like it is smth new even for Matt Cutts ;)
Labels: Google Supplemental Index, Matt Cutts