The blooming of information architecture at Google: A close look at facets, tags & categories in GoogleBase: A big overview of Google Base, and how Google has subtly done some amazing things with information architecture.
I just spent some time with GoogleBase and was amazed at just how deeply Google has embraced standard information architecture concepts and trends. We have categories, facets, tags. I kid you not. Google of the simple search box with a go button has come a long way indeed.
Specficially, the author is interested at how deeply Google has embraced faceted classification.