As tech giants Apple and Amazon apply the squeeze, there has never been a worse time to be in the publishing business. Apple has turned its disruptive death ray on the publishers with an update of its free “iBooks” app, which allows anybody with a Mac to build an ebook and publish for sale in the company’s iBookstore. The rapacious bastards at Amazon are attacking on the same front with their KF8 Kindle software, plus they’re signing book authors (Deepak Chopra, Timothy Ferriss, James Franco, Penny Marshall and more to come) to their publishing imprint. An email, purportedly written by an anonymous book industry “insider” and published at PandoDaily today, got a lot of attention on the Web with its claim that Amazon’s ultimate goal is to destroy conventional publishing.