I use DropBox all day everyday, If you want to try the pro version for free for 3 months, let me know and I can hook you up.  Below is the email that I received from DropBox:

Hi Jan,

We just wanted to remind you that you can give a free 3-month trial of Dropbox Pro 100 to anyone you’d like. It’s our way of thanking you for being a Dropbox Pro user :).

To send your trial invitation, head here:
https://www.dropbox.com/gift/send

Enjoy,
– The Dropbox Team

P.S. The Dropbox Pro trial invitations expire on August 30th, 2012.