Extension written by Donal K. Fellows which allows arbitrarily shaped windows on X11 and Windows to be created.  MacOS and MacOS X are not yet supported.

http://www.cs.man.ac.uk/~fellowsd/tcl/#scripts/shape

Something like this needs to be combined with a 'drag and drop' extension to allow proper dragging of arbitrarily shaped objects from, e.g. a canvas or a text widget (where you might want to drag a non-rectangular block of text).
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Does anyone have plans to really add proper 'drag and drop' support to Tk?  Any [TIP]s in the pipeline?

''[MGS]'' 2003/03/26 - I think the best bet may be [TkDND]

''[DKF]: 27-Mar-2003 -'' It's on the [Tk 9.0 Wishlist].