I'm the sort of guy who learns by doing, and so after 9 months of studying iOS development, I have 'done' a lot. A lot of the so called apps that I have made are a quick test of a certain framework, or maybe even just some experimentation with a particular Cocoa Touch View / View Controller. Nonetheless, there are over 100 functioning (this is what I'll call them, don't judge me:) applets on my hard drive. I wouldn't say that any of them are in a state where I could feel comfortable putting them on the App Store, but they exist, and they work.