One of the main uses of PDFs is to send comps to a printer in exactly the format that it will be printed. As a prepress tool it is fantastic. I have also used it for many years (since version 1 from Adobe) to create exact copies of documents that were submitted to the Government -- reports, contracts, and invoices to name three. In this area PDFs are alive and well. They record the document at a specific time and are not subject to changes in the original software as future versions are released. (Case in point is the change in IE rendering around version 5.)
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