I’m always intrigued by technologies that enable on-the-fly creation of media (print, Web, video)–what Adobe dubbed "network publishing."  Recent examples I’ve found interesting:

• "MagCloud enables you to publish your own magazines. All you have to do is upload a PDF and we’ll take care of the rest: printing, mailing, subscription management, and more."  (Kind of a step up from my 8th-grade experiences publishing a skate ‘zine with a friend’s Mac & my dad’s office Xerox.)
• On another skating note, Zazzle now enables creation of customized skateboard decks. [Via Bryan O’Neil Hughes]
• Faber Finds publishes out-of-print titles, generating a unique cover for each on the fly. [Via]