RE: visual mark for column > 80

[Drew Adams]

> I want to mark the transition to lines over 80 characters with either a
> vertical line or a change of background color.
> 
> The idea is to keep code below 80 characters where fill mode 
> doesn't do the
> job. I want a visual of which lines are too long but it a way 
> that won't ruin
> syntax coloring in the rare cases where I'm willing to accept 
> this manually.

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

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

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