Based on the emails I receive, more and more of you are using Google Drive to store your paperless documents.
I just noticed that HelloFax has a new Google Drive add-in that allows you to fax your Google Drive documents right from within the Google Drive web interface.
I have written about HelloFax before, and it is a great service. You can send five faxes for free to test it out and then either sign up for a monthly plan or pay .99/fax on an ad hoc basis.
I tested it out and it works well. Great feature if you are a Google Drive user. At the time of writing they are having a contest to win a Chromebook Pixel if you try it out.