Dropbox 2.2.9

Dropbox is a Web-based file hosting service operated by Dropbox, Inc. that uses networked storage to enable users to store and share files and folders with others across the Internet using file synchronization.

Dropbox uses the freemium financial model and its free service provides up to 18 GB of free online storage (2 GB + 512 MB per referral).

Dropbox Features
Your files are always available from the Dropbox website.
Dropbox works with Windows, Mac, Linux, iPad, iPhone, Android and BlackBerry.
Works even when offline. You always have your files, whether or not you have a connection.
Dropbox transfers just the parts of a file that change (not the whole thing).
Manually set bandwidth limits -- Dropbox won't hog your connection.
Invite friends, family or teammates to a folder. It'll be as if you saved the folder to their computers.
Create photo galleries viewable by anyone you choose.
Send a link to any file in your Dropbox using your Public folder.
Dropbox keeps a one-month history of your work.
Any changes can be undone, and files can be undeleted.
Secure Sockets Layer (SSL) and AES-256 bit encryption.