With the iPhone 6 set to come in two separate display sizes — a 4.7-inch model, and a 5.5-model — Apple needs to increase the iPhone’s resolution to keep up. But what will the new resolutions be? Up until now, Apple has stuck with 326 pixels-per-inch for all Retina iPhones, but will larger iPhones require higher pixel densities.

Pulling out a spreadsheet, Daring Fireball’s John Gruber worked out the math for what he thinks the resolutions of the iPhone 6 will be. Using the Pythagorean Theorem, Gruber says that he thinks the 4.7-inch iPhone 6 will keep the current iPhone’s 326 pixels-per-inch, but the 5.5-inch model will have an astonishing 461 pixels-per-inch, making it practically Super Retina.

Over on his official Flickr stream, Daring Fireball’s John Gruber has posted this beautiful shot of the iPhone 5c packaging.

Last week, one of the most interesting Mac programs to come out in years hit the App Store in Sparrow for Mac, an elegant and attractive e-mail client that looks and acts a lot like Twitter.

I loved it, comparing it to more full-featured clients like Postbox 2 by saying Sparrow was “the equivalent of skipping stones, not piloting a submarine.”

I decided to reach out to Sparrow for Mac team member Dom Leca and ask him a few questions about the origins, inspiration and future of the e-mail program that treats your Gmail as if it were Twitter.

Following yesterday’s story that Steve Jobs and Rupert Murdoch might meet on stage to debut the world’s first iPad-only newspaper, comes a new report suggesting not only that Apple will hold that event on December 9th, but also use it as an opportunity to unveil a new subscription billing option for periodicals on the iPad.