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If you use Gmail for your email then you simply must install the Gmail app on your Nexus 7. It is the best Gmail app on any platform and offers a user experience that rivals the desktop.
Not everyone is into the Google+ social network but for those who are this app is a wonderful way to work with it.
It presents the current news feed in a gorgeous magazine layout that makes working with Google+ a lot of fun. I admit I never used Google+ much until getting this app.
The Google Hangouts feature is particurlarly useful on the Nexus 7 as it allows video chatting with up to 9 friends at once.
I couldn't list my top apps for the Nexus 7 without including the Evernote app. I am heavily ingrained in the Evernote cloud service and this app is one of the most heavily used on my Nexus 7.
I'm not that big a fan of the current interface design but it gets out of the way when I am working with my notes.