Add an event in just two quick taps. See how full your week or day is at a glance. It works with the built-in iPhone calendar but it’s faster.
Come for the better looking interface than the built in iPhone Calendar and Helvetica. Stay for the OMG-it’s-so-much-faster-and-easer-to-add-events-its-mind-blowing. (thx Blue Perez for the pointer to this)