visible pixel margin as a visual cue

[PT <mailshield.gg@mailnull.com>]

I saw this in other editors and wondered if emacs can do something like  
this. I found this page in the Emacs Wiki:

	http://www.emacswiki.org/cgi-bin/wiki/MarginMode

The picture at the bottom shows what I'd like: a visual cue to avoid  
writing too long lines (I know there's autofill). Unfortunately, this  
requires XWEM and the other solutions only add faces to characters in the  
buffers, so they don't actually draw a vertical line.

I think Emacs 21 can display graphics in a buffer, so I thought of  
something like putting a graphics overlay onto the buffer text. Can it be  
done with a standalone package (no XWEM)?

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