No, there is no way currently to create folder structures but many of us continue to make this request. At least there's no way that we know of, and we have requested this many times. Yet be encouraged, there are many changes being made already to this paltform and I'm sure that it will not be long before they start including this, even if it is just for the simple fact that so many of us are requesting it. To go around this we create a duplicate workspace and link them, through creating a shortcut in each workspace to the other one it's referring to, making one primary and one a backup. When one workspace gets congested we simply use the move option and move those excess documents into the backup workspace. This at least allows us to have a less cluttered and more manageable primary workspace until they can figure out the folder structure option. Let me know if you need any help with this, or if this helps you in any way.
Brian/Treebreeze
Brian K. Woytovich (Treebreeze)