Another way this could be done would be to create a customer Automator Workflow and save it in /Library/PDF Services/

Use the "Save PDF to Web Receipts Folder" as a template. Can also add timestamping and other information.

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The difference with a dedicated PDF Printer is, that it can be used non-interactively from any script and without any GUI needed. This can be very handy if you want to automate workflows or processes that do not involve a user to click buttons.
I'd like to see a CUPS receipt that will allow me to automatically sign a PDF I print through it with a cryptographic signature. I haven't yet found any automated solution to do this on the Mac. Pepi

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Except that Save as PDF won't work in Adobe Reader 8 - Adobe blocked this. Why would I want to save a PDF to PDF?

Form PDFs don't allow saving, so the helpful note from Adobe when you open one says to print a copy after filling in the form if you want a record of what you filled in. But you can't save to PDF when printing from Reader 8, so the only way to get a digital copy of the filled-in form is to print thru a virtual printer.

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