Users who have purchased at least one of the latest iWork applications and are iCloud members may be able to sync all kinds of documents -- not just iWork files -- between Macs running Lion, researchers have discovered. Putting files in a special folder inside the (normally hidden) user's Library folder "pushes" the file to iCloud and other Macs that have the same iCloud account. The feature could be sign of a future iCloud expansion, or just a bug that Apple will block eventually.
