There’s an interesting article at Mobile Marketer that complements my observation last week that you don’t have to have your app consume a large proportion of a user’s time spent on the phone for it to be useful.
Magnus Jern takes this to the extreme when he asks "is there anything wrong with 1 million people using your app only once".
"You can draw a parallel between a mobile app and a viral video, an advertisement on YouTube or a brand microsite. Most people will only visit it once, but the brand manager will be very satisfied as long as the interaction has made a longstanding impression."
Jern goes on to give some great examples of such apps. He also makes the observation that these apps, being simpler than core business applications, can be quicker to develop.