Most of the popular consumer cloud storage offerings seem to have a referral program that gives users more space at no extra charge in return for recommending the service to their friends.
LogMeIn has now started such a program for Cubby, offering a relatively generous 1GB per successful referral.
One of the main differences between Cubby and Dropbox is that Cubby allows users to link arbitrary folders with Cubby, so you don't need to change the organisation of your folders or mess around with symbolic links in order to share or sync an additional folder.
And when it comes to collaboration, cubbies can now be shared with shared with anyone, not just the people you invited to join the beta program.
LogMeIn recently introduced Cubby apps for iOS (5.0 or later) and Android (2.1 or later).
The iOS app has just been updated, and now allows any Cubby file to be opened in any other app.