iOS 4, iPhone's OS, added the feature to put applications in a folder. After I upgraded, I immediately began organizing my apps. One of the folders I created was the "often used" folder. After two days of use I realized that this wasn't such a great choice, because now I had to open up the folder before I was able to start the app. Right next to the folder are some apps that I don't use at all. I didn’t bother putting them in a folder. But now I know: that should have been the other way around.
As a software developer, let's learn from this. There are two lessons:
1) Often used functionality should be easy to access. Rarely used functionality doesn't have to be easily accessed so it can make room for often used functionality.
2) Users can make up their mind, because they started to use the product.