I had a very strange experience today. It was a warm winter's day, and we had a fire going outside. Glass of wine in hand, I was fiddling around with the iPhone (as one does - usually to one's wife's discontent) - specifically a cult favourite app of mine, Mood Agent . As I launched the app, it popped up a message telling me that I needed to uninstall and reinstall to "see all new features". Mmmm. Bit of a pain in the ass. I like the app, so I dutifully plugged in, uninstalled and reinstalled. At which stage, I noticed that the app icon had changed to say: Mood Agent FREE. Anyone who has any experience with the Apple App Store knows exactly what that means: This is a feature hampered version. Like the shareware model, but with more tease. There's a better version waiting out there, for some cash. Now here's the interesting bit of the user experience. Firstly, the app caused me some hassle with a reinstall. I don't know why, and frankly I don