For anyone wondering when this will come out for Apps:

  A Google Apps version of Google Drive will arrive for 
  Google Apps admins on the rapid-release track "over the 
  next few weeks," Google said; it'll also include 5GB free 
  but monthly prices beyond that will be somewhat more 
  expensive, for example $4 a month for 20GB or $89 per 
  month for 1TB.)

  http://news.cnet.com/8301-1023_3-57419024-93/google-drive-its-slick-integrated...and-not-exactly-free/

When GDrive for Apps launches, it will enable a new sort of workflow, where a user can open specified file types in GDrive with internal webapps behind a VPN. If combined with the existing Google Docs API, this could be the start of a whole new class of business process apps. Interesting.