Cloud to-do list company Orchestra today announced Mailbox, an email client for the iPhone it's been building for the last year. I’ve been testing Mailbox for the last few weeks and it’s nothing short of spectactular. It’s the best (and certainly the most modern) Gmail client for iPhone since Sparrow, and operates on a simple premise: how do you turn the mobile email inbox into a to-do list, but in a non-obtrusive way? The app feels like a combination of Sparrow and Clear — a beautifully designed messaging client meshed with a swipe-able productivity app. "Most everyone uses email on their phones, and most everyone hates it," Orchestra CEO Gentry