Greg Notess has come across another example of why we need to use more than one search tool and why Google is not always best. In his recent posting
Page Found at 3 or 6: Not Google he shows that a web page he could not find in Google – a page on a Canadian academic site that has existed since at least 2003 – was indexed by Yahoo!, Gigablast, and Exalead, but it not by Google, Live, or Ask. The article is accompanied by a short screencast.