> For what it's worth, I notice that the Mac UI deals with drag & drop by
> making the dragged item either transparent or translucent, so that you
> can see the item underneath that you might place it in.
> 
> Also, the accepting item is highlighted when passed over.  (I guess
> Squeak already does this in some cases such as when dragging methods
> into new categories.)

That combination might work well.  Squeak will highlight projects you
are about to drop into, but it doesn't always help very much because
project windows are so small -- you often can't see the highlight!  With
translucency, you could see the highlight.

Doing it for bookmorphs seems sensible, though mildly overkill somehow. 
But I guess if we are going to allow huge morphs to drop into
moderately-sized bookmorphs, then it would make fine sense.


> 
> (I was also a bit surprised to notice that the Mac also uses the
> location of the mouse to determine the drop point, not the middle of the morph.)
> 

Hmm, interesting.


-Lex