Manage Email With a Simple SwipeThe mailbox app lets users schedule, delete and archive messages with a simple swipe.

"If e-mail was the original online game-changer, it hasn't changed much since," says Gentry Underwood, co-founder and CEO of Mailbox, an app for iOS. "It was remarkable at the time, but it wasn't designed for a world where we're carrying e-mail around in our pockets," he says.

Mailbox, recently acquired by cloud-based file-hosting service Dropbox, enables users to quickly and easily manage their inboxes on the go. Using simple swipes, readers can archive a message, delete it, move it to a folder or--this is the cool part--schedule it to reappear an hour, a day or a week later.