Do any any minimal WMs, like scrotwm or xmonad (OR any others), support drag and drop between windows out of the box? If so which? If not, is there a way to enable such functionality?A classic example would be to have a file manager in one window, from which you drag a file into an open application in another window to open it, etc. etc.
Drag and drop between windows in tiling i.e. minimalist WMs?
window manager;drag and drop
In X11, drag and drop is something that the application must support, it has nothing to do with the window manager.  For example: you cannot drag'n'drop anything in a xcalc window, even with the Compiz window manager.The X11 drag and drop protocol is called XDND: see http://www.newplanetsoftware.com/xdnd/ for more information.