This seems like a really useful utility!   
My first experiment was to create a 'DropBox' folder on my desktop.  I then created a bunch of rules that would move files to my various document folders based on their filename and/or extension.  E.g. any files with a .xls extension get moved to my Excel folder.  This means I can save or drag everything to my DropBox and have it automatically filed.  Over time I will expect to develop a file naming convention to deal with more complex filing rules, but for now it's working pretty well.
			
		 A very neat idea. If I ever get Hazel to work (see my post to support if interested) I shall emulate your idea.
  A very neat idea. If I ever get Hazel to work (see my post to support if interested) I shall emulate your idea.