I've never tried making a mock-up of an iPhone app before, but I was inspired to because I really want an app that allows for quick entry of location-based reminders. Since Apple introduced iOS 5 last Wednesday, I've been using the heck out of the location-based notification feature in the Reminders app. However, it takes between 9 and 11 finger taps in order to create a reminder. Too many to be really useful.
Due is an app that I have long been using to create quick reminders that alert me at a specific time. I emailed the developer to see if he had any plans for adding location-based functionality, and he said no. I think that if I had Siri on my phone I wouldn't have such a desire for a quick-entry location notification app, but as it is I think the market is lacking in this area. So, as I said, above is my mock-up of what I would like to see for an app. The UI is largely influenced by Due, but oriented toward locations rather than times. I think 9 settable 'common places' is more than enough. I actually had some difficulty coming up with 9 for examples. Let me know if you have any thoughts or comments on the concept.