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Jelly Bean home screen
Fancy Widgets and standard Jelly Bean Home Screen
This is the standard Nexus 7 Jelly Bean home screen. The weather/clock widget is Fancy Widgets.
Ultimate Rotation (7-day free trial available)
For those who don't want to root the Nexus 7 or even install a replacement launcher, Ultimate Rotation allows rotating the home screen (and other functions) using the standard Nexus 7 Jelly Bean launcher.
Here's the last home screen rotated into landscape.
I am a heavy Evernote user and the app works well on the Nexus 7. The most recent version takes full advantage of the larger tablet display with sliding panes as demonstrated in this screen.