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Yes, the Nexus 7's built-in on-screen keyboard is nice, but SwiftKey is light-years better. Not only does it have an uncanny ability to know what the word you're typing is, the gestural system allows you to type without lifting a finger off the screen.
It sounds complicated, but I assure you, it isn't, because if it was, I wouldn't be using it.
OfficeSuite Pro 7 (PDF + HD)
Having to handle Office documents are an inevitable fact of life for me, so I need something that can allow me to create and edit Word, Excel, and PowerPoint documents.
OfficeSuite Pro 7 does just that, while also throwing in the ability to view PDF files.
A solid, reliable app.
File Manager HD
I need a file manager because ... well, because I can't have one on iOS, and I happen to like rooting through the file system.
I went for File Manager HD, not only because it was cheap, but because it does what it says it will do on the tin, and also integrates with cloud services such as Dropbox, Box, Google Drive, SkyDrive, and SugarSync.