Macworld:

The first true automator for iOS, Workflow takes full advantage of Apple’s looser restrictions on sharing to bring new levels of interactivity and multitasking to our handheld devices. More versatile than the situational IFTTT and more powerful than even Launch Center Pro’s slick system of shortcuts, Workflow’s endlessly customizable actions integrate seamlessly into the apps you already use to help you work smarter, faster, and just plain better.

I have yet to try this app (not really the target customer), but if my Twitter feed is any indication, many people find it incredibly useful.