Opening or viewing files can be more intuitive. Maybe its an idea when
right clicking a file, the first entry in the menu would be "View
file" (with the internal viewer or so...) and the second "Open file
(gedit)" with between brackets the last editor used for opening the
specified extension (or file type when using tools like file to
determine its type).
At this moment, the left bar shows some examples, but not always
working (sometimes saying that it is impossible to open a directory,
but it really is a file).
The right click is faster to use, but not mostly showing to many
options and within a submenu.
In Gnome 2.8, and fc3, nautilus no longer supports viewers. Files are
always opened. (and its much easier to configure what app opens a