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Android has good support for Google Docs but if you need Microsoft Office support this is a good solution. It handles working with Word, Excel, Powerpoint, and PDF documents. It won't always work perfectly with sophisticated Office documents but does a great job with most of them.
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.