One main reason I like Android over iPhone is widgets. With widgets I can, at a glance, look at the information I need. In iPhone I had to open an app, waiting for it to load and then finding the information I need. Calendar information is something I want to quickly get to. Smooth Calendar is the widget I like the most. And it is free. Try it out.
The following screenshot has the Smooth Calendar below the weather time widget. The weather widget is Beautiful Widgets.