Following its launch for iPad back in October, Cannonball garnered quite a bit of fanfare for its slick email client that sifts out the important messages you don’t want to miss from all those coupons, subscriptions and newsletters. And today, it’s available for iPhone users too. To recap, Canonball’s subscription management system groups messages together automatically and marks them as read, meaning you can easily delete them in bulk enjoy simultaneously in a magazine-style format. ____ The general principle behind Cannonball is similar to that of Gmail’s very own auto-filter feature which separates your inbound mail into four categories, each...

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