We need home screen customization
When iPhone first came out and nobody knew what an "app" was, the home screen layout made sense. Put the emphasis on the competitive advantage - apps. However, now that apps are mainstream on other products it's time to take a look at what people really need from their home screen.
Every person needs something slightly different. For instance, it would be nice to have a Today-style home screen where I can see my calendar and recent messages at a glance without having to launch any specific apps. Someone else may want something else. The solution to this is widgets.
You have to wonder why adding simple features like this are taking so long in iOS. It took 2 years to implement cut/paste. Email is still lacking basic features found on desktop clients, photo album is severely limited in functionality, notifications are a mess, you can't access your call history while on a call... the list goes on. Yet while basic things are given zero priority, we get stuff like HDR photos - nice but hardly in high demand.
Sure you can jailbreak your iPhone, but that's not something the majority of users are willing to do. It's very sad that you have to go to Android, Blackberry or WM 7 in order to have a more productive home screen.