Former Tumblr CTO and Instapaper founder Marco Arment has launched a digital magazine in the iTunes store. Arment’s “The Magazine” will offer four articles every two weeks, highlighting top technology writers and ideas. The app, only available to iOS 6 subscribers, will be available via a 7-day free trial which then turns into an auto-renewal at $1.99 per bi-monthly issue. [Source GigaOM]