Info on how to set up your Mac to let iOS devices "print" to a PDF through it: http://i.tuaw.com/2010/11/16/how-to-create-pdfs-with-your-io...

Requires hacking with currently released version of Mac OS X because there's some controversy about when/if AirPrint-through-a-Mac-or-PC will be coming. Some say it's cancelled, but that sounds kinda crazy to me: why even ship the feature on iOS if it's only going to be able to print to a small portion of HP's line of printers?