Bittorrent Sync is a Dropbox-like service through which the bittorrent protocol is used to synchronize all your devices. I recently used it to receive a large file from a friend in Los Angeles, and I was amazed and delighted by the speed an ease with which it came down. Bittorrent is calling for alpha testers to help it refine the product for its official launch.
Correction: An earlier version of this story got it wrong. I misremembered how the Bittorrent Sync product worked and erroneously believed that it used a cloud of bittorrent users to cooperatively share synch duties for one another.
It's exciting to see a more decentralized, redundant approach to cloud computing. Of all the resources we use with our computers, bandwidth is the scarcest and most fraught (since it's controlled by evil phone companies and mined by lawless spies). Storage, meanwhile, is fantastically abundant -- hard drives get so much cheaper so much faster that it's sometimes mindboggling. Many of us have storage to spare, and swapping that for cloud-based storage for backup, sharing and collaboration makes good sense.
The Bittorrent Sync architecture is reminiscent of the Freenet Project, a classic censorship-resistant file-sharing technology. I'm really looking forward to seeing what they come up with.