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If you are a heavy Google Reader service user like me then you need a good app to handle the task. There are some good ones in the Google Play store and my favorite is gReader Pro.
This app has a clean interface designed to make it straightforward to work with lots of RSS feeds in Google Reader. It syncs with Google Reader on the fly so you never have to see the same article twice. It is as fast as any app I've tried for handling thousands of RSS items in one go.
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.