Bitcasa
Digital storage.
Bittorrent Sync
The most widely used storage format for sharing pirated content, Bittorrent is making an effort to be known for more legit offerings through it's Sync app that synchronizes files across devices apart from the cloud.
Box
Digital storage focused on business solutions.
Dropbox*
Online file storage for backups. Syncs folders automatically on several devices. 2 GB free. 100 GB for $10 a month.
Flickr
Easy
to navigate, though not the best app for shooting and editing photos.
But the free terabyte of storage makes a a good place to dump
everything. The Creative Commons licensing section has free stock
photos.
Google Drive
Document storage. Open and edit files from within browser windows. 5 GM free. 200 GB for $10 month.
Media Fire
Free cloud storage service.
OneDrive
Microsoft provides 15 GB free backup to the cloud for storage. OneDrive includes a nice interface for scrolling through material (particularly photos). Formally Skydrive.
Spundge
Read, save, filter and annotate content from the web — Facebook,
Flickr, Instagram, Twitter and YouTube included. (Free and paid
versions)
SugarSync
File backups accessible on all operating systems and platforms. 5 GB free. 60 GB for $10 a month.