Sorry, but how is that "like Dropbox for Hackers"?
I don't know why you would equate ruby gems with 'hackers' unless you really like people to be disoriented.
Why don't you call it by name (i.e. "hosted RubyGems server") instead of confusing people and trying to piggyback on the "Dropbox" brand? Or do you think that your product isn't good enough?