There are two kind of applications in the App Store: those that help you accomplish tasks for your digital life, and those that help you in the real world. Think about twitter clients and apps to remember the World Cup schedule. Don’t get me started on Twitter clients.
As for the “real world” apps, we could go on talking about them for hours. I swear I saw apps to help women remember their period. There are apps that comes with entire databases of international recipes.
Now, we have a Ruler.