My tiny program regularly scans a dropbox folder. If it finds a pdf, it prints it and moves it to an archive folder. That was just to avoid every family member emailing me documents so it is nicely printed by the time they get home to study.
That's brilliant, my girlfriend and roommates refuse to install the printer driver onto their computers and print things themselves so it's an endless cycle of bugging me to print things. Going to get this going when I get home today.