Is there a way to get a vertical line between the fringe and the buffer, such as in http://manual.macromates.com/en/navigation_overview#collapsing_text_blocks_foldings?
EDIT -- See http://screencast.com/t/rpY9abzQK for the 1-px wide separation line I'd like to have between the 8-px fringe and the buffer itself. I hope it's clearer now...