The launch of Apple's Newsstand -- an app-like piece of software utilizing Apple's iCloud service to keep all subscriptions in one place allowing readers to pick up on one device where they left off on another -- looks to be encouraging sales of digital subscriptions.Conde Nast reports a 268% increase in subscriptions since the release of Newsstand two weeks ago as part of the new iOS5 operating system. The single-publication sales of its nine magazines offered on iTunes are up 142%, according t...