The equation is pretty much built into the connotations of the word as it's currently used. Documents called "articles", "reports", "wikis" or "blogs" don't cre

The equation is pretty much built into the connotations of the word as it's currently used. Documents called "articles", "reports", "wikis" or "blogs" don't create the expectation of potentially being printed and bound like documents called "books" do, even if all of them are being viewed using a web browser. This is most likely going to change, but we don't seem to be there yet. It might even be that the word "book" just can't shake off the print connotation, and will end up going the way of "folio" and "vellum" as an obsolete format-specific word when printed books start becoming curiosities.