5 million businesses and growing

Google Drive - online documents with real-time collaboration
Web-based documents, spreadsheets, drawings and presentations that let users edit the same file at the same time so you always have the latest version.

Anytime, anywhere access to your work
Google Drive is securely powered by the web, giving you the flexibility to be productive from your desk, on the road, at home and on your mobile phone, even when you're offline.
Works across operating systems
Google Drive on your Mac, PC or mobile device (or your browser) gives you a single place for up-to-date versions of your files from anywhere. In addition to any file type you choose to upload, Google Docs are also stored in Google Drive.
Easily upload and share files
Share individual files or whole folders with individual people, your entire team or even customers, vendors and partners. Create and reply to comments on files to get feedback or add ideas.
Secure access controls
Administrators can manage file sharing permissions system-wide, and document owners can share and revoke file access at any time.
Live Updates from Google 

Share Docs, Slides and Drawings with people who do not have a Google Account - October 07, 2013
Domain labels, Mobile updates and a new API for using Google+ at work - August 14, 2013
Monitor user logins, storage consumption and apps usage with the Admin SDK - October 01, 2013