Until I have time to write a proper essay, I will settle for identifying a few sites that I visit on a very frequent basis. The on-line New York Times (, available without charge, has from the start recognized that this medium has possibilities far beyond being a digitized newspaper. I now buy a significant proportion of my books from (, which has added a number of interesting features, including a nice example of "social filtering" to aid in book recommendation. I also find and buy many airline tickets with Expedia ( And for rental cars it seems particularly efficient. On-line travel agencies have room for improvement, but they're coming along.



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