Not exactly what the "DIN Official Storyboard" spec shapes
might be (grins), but it's so easy to draw rectangles and ovals and add text,
move them around, format fill, line, text colors etc. Very free
form.
Also, you can import bitmaps and other foreign object quite
easily from the Insert > Object / Picture menus. When you import a bitmap,
you automatically get text attached to the shape at the bottom. That means you
could import an illustration, select and type, and bam, you've got story text
underneath the illo.
Check out Visio Extras > Callouts for interesting callout
and word balloon shapes.
Hope I'm somewhere near the mark...
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Hope this helps,
Chris Roth
Visio MVP