It has always been possible to manually upload folders and files to Google docs, but Google Drive does this automatically in the background, meaning you never have to think about it. This also makes sharing the data if you want to very easy. Clearly, this is a major challenge to Dropbox which has been the dominant provider of these types of services.
The first 5GB per user is free which for Google Apps domain administrators represents extremely cheap online storage. This is ample, particularly if users are creating, storing and sharing documents as Google Docs (which are not subject to any quota).
For a number of years Google have challenged the idea that businesses require email servers, with business email being the core element of Google Apps for Business. With the addition of Google Drive, there is now an alternative for onsite file servers too.
If you'd like to discuss the use of Google Drive in a business environment or any other Google Apps, please contact me on 0843 289 0462 or visit www.thirdwayit.co.uk to learn more.