Wuala

Wuala is a free social online storage which allows its users to securely store, backup, and access files from anywhere and to share files easily with friends, groups, and the world. Tens of thousands of users and thousands of communities around the world are already actively sharing millions of files, growing quickly.
Wuala is based on a revolutionary technology that was researched for the most part at ETH Zurich (Swiss Federal Institute of Technology). Users start with 1 GB of storage but can get as much as they want, either by trading idle disk space or by buying additional storage. All files get encrypted before they leave the user's computer and the user chooses who gets access to which folder. No one else - including us - gets to see the files. Wuala comes as a convenient application for Windows, Mac, and Linux that can also be started directly from within the browser, elegantly bridging web and desktop.
Wuala is developed and run by Caleido Inc., a start-up based in Zurich, Switzerland. In March 2009, Caleido merges with LaCie, the french provider of external hard-drives, to work on the future of cloud storage.