Google's Office Compatibility Extension.
Google's Office Compatibility Extension enables you to drag Office files into Chrome, open them in Gmail, and open them in Google Drive (provided you are using the latest version of Google Drive). Once the file is opened you can edit it and save it in your Google Drive and or download it as an Office file to send to people who prefer Office files.
Office Compatibility is being rolled out to all Google Apps for Edu domains in the next few days. You can read more about that on the Google Apps Updates blog.