7 Things Google recommends to do with gDrive

http://googleblog.blogspot.com/2010/01/upload-your-files-and-access-them.html 
http://googledocs.blogspot.com/2010/01/upload-and-store-your-files-in-cloud.html 
and
http://googleenterprise.blogspot.com/2010/01/store-and-share-files-in-cloud-with.html
says

• As a replacement of thumbdrive.
• Access work files from home.
• No need to email yourself.
• Even for attachments greater than email limit
• To do team work.
• To backup files, pictures etc.
• Google Viewer for opening file whose applications are not installed in your machine.

 Also read google-gdrive=docs.google.com