I found a way to get syntax highlighting for restructuredtext (docutils) when I was using gedit 2: http://mail.gnome.org/archives/gedit.../msg00012.html.

This went away when I upgraded to Oneiric Ocelot, which uses gedit 3. However, I got it back when I placed the same file in
Code:
@bob-desktop:~/.local/share/gtksourceview-3.0/language-specs$ ls
restructuredtext.lang