Sugarsync. I was using Dropbox only but now that a discovered Sugarsync I'm migrating over. More space and more features best of all compatible with the newest bb operating system.
Posted from my CrackBerry at wapforums.crackberry.com
Essentially a 'virtual drive' that is automagically sync'ed across EVERY device you have hooked up to your SS account...save the file(s) there and forget about them.