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Beautiful Widgets handles screen rotation beautifully, as demonstrated in this landscape screen.
Note that home screen rotation was possible due to the Ultimate Rotation app.
Another clock/weather widget is Fancy Widgets. While not as many skins are available as in Beautiful Widgets, this one is quite good for customizing the appearance of the Nexus 7 home screen.
Many Android apps install widgets for use on the home screen, and the Flipboard widget is a great way to keep up with what is important to you.
It can be set to automatically refresh at a specified interval or set to manual refresh by tapping the icon on the widget.