7. Google Docs (Free)
Main features: View and edit text, spreadsheets, slideshows and PDFs stored on your Google Docs account. You can also create text and spreadsheets from scratch, but not slideshow presentations.
Notable extras: You can view images that you’ve uploaded to your Google Docs account.
Conclusion: You cannot upload office documents to your Google Docs account through this app, although you can upload images. Apparently, it’s meant to mainly serve as a companion tool to the Google Docs site -- i.e. you upload your documents to the site first, and then use this app to view them, do simple file management, and very basic editing.