this is far more user friendly than Dropbox, allows uploading of files and moving files around even when off line to be synced later - Also has auto sync for phots from your BB
you get 500 G free with unlimited referral bonus
Referral link - if you join both you and I get 500 MB extra storage free.
Dropbox for my 9900 doesn't open, but I actually have my dropbox folder as one of my sync folders with sugarsync and it DOES open there! Add to that how much more intuitive sugarsync is, and screw dropbox.