[CamperBob]

Does this sharing process still carve a giant hunk out of the recipient's Dropbox space allocation, though?

That's what I don't understand about any of these services -- Google, Dropbox, and whoever else. If anything is "unlimited" these days, it's disk space. At this level of play 5 GB is about 25 cents worth of storage at most.

Paying for disk space in the cloud is no smarter than renting a cable box from Comcast or leasing your phone from AT&T. If Dropbox could just get past the notion that disk space is worth anything, their value proposition would become a lot more interesting.

If bandwidth is the real concern, which I imagine it is, then they need to find a way to charge for that instead.