Bump for bittorrent sync. I've been very happy with it as well.
It's not cloud storage but as long as you keep one of your computers running, it does exactly the same thing as dropbox only...
- its free
- its faster
- it allows more control over syncing
- it allows for the use of secure keys for sharing files
There's also a potentially significant security benefit to Bittorrent Sync, because you're the only one with a copy of the files. That's a big deal if you don't like the NSA requisitioning dropbox for your data. There's a caveat though, in that its not open source yet. Such as it is, we're still encrypting sensitive data before it gets synced, but BTsync is a big step in the right direction.