...and let us not forget that our own Steve Knight makes one that will
handle both male and female components:

http://www.knight-toolworks.com/speciality.htm#Dovetail   

> As i understand it they would make a dado (rectangular groove)
> across the width of the panel then follow with a special plane to
get
> the right angle for the dovetail -  at the recent williamsburg conf
> ted ingrham had a plane that would cut on either side for this type
> of work.... although i think you can saw it at an angle too if you
> have good saw control and are brave, i think that they would use a
saw
> similar to stair saw for that (has depth stop)... they are
> generally tapered so they are driven home tight when fully
assembled.
> you also have to get the special plane for the other (male) half....
I
> believe ECE still makes one of them.  havent ever done one myself,
just
> some recollections from books....

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