Xcode 4 has introduced many improvements, but you have to know how to use them – and know they exist.
One extremely useful feature is Xcode 4’s capability to create outlets and actions automatically with a simple drag and drop operation. This means that you can create your @property, @synthesize methods, and declare your instance variables without needing to enter any code at all.
Oleb Begemann has put together a short guide with images and a short video demonstrating how this is done.
You can find it here:
A useful tip that has been added to the Xcode 4 tutorial and guide page.