Maintenance release, version 126.96.36.19937, is obtained via www.cubby.com
Preview release, version 1.1.20224, is obtained via preview.cubby.com
Fore release notes, see here: http://help.cubby.com/knowledgebase/topics/29178-release-notes
I am a heavily committed user of Dropbox, but Cubby is seriously better for three reasons:
1. DirectSync feature gives gives unlimited syncing between computers outside the cloud.
2. Files and Folders to be synced don't need to be gathered into one master folder, can be synced from anywhere.
3. iPhone app allows selection of folders as well as subfolders and files for offline viewing, unlike Dropbox.
I have had one or two hangs and crashes while testing, but it is still beta so I cut it some slack.
If it matures properly this "blows Dropbox out of the water" to use a cliche.