The most interesting part of this article for me was the connection between search engine algorithms and old-fashioned manual cataloging.  It never occurred to me that they are really the same concept, just that one is used in a real-world format and the other is in an electronic format.  I was alive and doing academic research for school when manual catalogs were still in popular use but I was to young to be expected or taught to use them.  By the time I became old enough the schools I went to wanted to teach the new, up-in-coming electronic cataloguing technology to the exclusion of the manual version.  As a result, I never got real exposure to manual cataloging so I never put much thought into the different ways by which it could be done.

I think it’s interesting that keyword-in-context indexing is based on the same logic of manual cataloging systems.  I think its incredible how complex cataloging has become now that we have computers that can process mass amounts of data.  The complexity of the algorithms is really astounding and its something I rarely think about when I enter a search-word into Google.