The New York Post is reporting that digital journalist Josh Quittner is leaving Time magazine to join startup Flipboard as its new editorial director. Flipboard is a personalized social magazine app for the iPad. You can enter your Facebook and Twitter accounts and follow any number of sites' RSS feeds, and the app presents all the tweets, status updates and articles to you as a digital magazine. The fact that Quittner, who covered the digital revolution for 15 years at Time Inc, is leaving underscores a tectonic shift happening in the traditional publishing industry. It seems that those in the know feel secure in their beliefs about the futur