small improvements

render :partial => filename, :object => @object can be written shorter since rails 2.0 like
render :partial => @object or render :partial => @collection
Also form_for is smart bout put and post for update and creation.

it helps watching older railcasts episodes :-)

app/views/notes/_notes_summary.rhtml

@@ -2,7 +2,7 @@
 <div class="note_wrapper" id="<%= dom_id(note) %>">
 <%= link_to( 
   image_tag("blank.png", :border => 0),
-  note_path(note),
+  note,
   :title => t('notes.show_note_title'),
   :class => "link_to_notes icon",
   :id => dom_id(note, "link")) %>&nbsp;