diff -r 2ca61e72c995 app/helpers/my_helper.rb
--- a/app/helpers/my_helper.rb	Mon Jul 30 01:32:31 2012 +0000
+++ b/app/helpers/my_helper.rb	Mon Jul 30 12:54:10 2012 -0400
@@ -18,4 +18,35 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 module MyHelper
+
+  # Renders a tree of projects as a nested set of unordered lists
+  # The given collection may be a subset of the whole project tree
+  # (eg. some intermediate nodes are private and can not be seen)
+ def render_project_hierarchy_notifications(projects)
+    s = ''
+    if projects.any?
+      ancestors = []
+      original_project = @project
+      projects.each do |project|
+        # set the project environment to please macros.
+        @project = project
+        if (ancestors.empty? || project.is_descendant_of?(ancestors.last))
+          s << "<ul class='projects mypage #{ ancestors.empty? ? 'root' : nil}'>\n"
+        else
+          ancestors.pop
+          s << "</li>"
+          while (ancestors.any? && !project.is_descendant_of?(ancestors.last))
+            ancestors.pop
+            s << "</ul></li>\n"
+          end
+        end
+        classes = (ancestors.empty? ? 'root' : 'child mypage')
+        s << "<li class='#{classes}'><label>#{check_box_tag 'notified_project_ids[]', project.id, @user.notified_projects_ids.include?(project.id)} #{h project.name}</label>"        
+        ancestors << project
+      end
+      s << ("</li></ul>\n" * ancestors.size)
+      @project = original_project
+    end
+    s.html_safe
+  end
 end
diff -r 2ca61e72c995 app/views/users/_mail_notifications.html.erb
--- a/app/views/users/_mail_notifications.html.erb	Mon Jul 30 01:32:31 2012 +0000
+++ b/app/views/users/_mail_notifications.html.erb	Mon Jul 30 12:54:10 2012 -0400
@@ -8,19 +8,7 @@
      ) %>
 </p>
 <%= content_tag 'div', :id => 'notified-projects', :style => (@user.mail_notification == 'selected' ? '' : 'display:none;') do %>
-  <p>
-    <% @user.projects.each do |project| %>
-      <label>
-        <%= check_box_tag(
-               'notified_project_ids[]',
-               project.id,
-               @user.notified_projects_ids.include?(project.id)
-               ) %>
-        <%= h(project.name) %>
-      </label>
-      <br />
-    <% end %>
-  </p>
+  <%= render_project_hierarchy_notifications(@user.projects.find(:all, :order => 'lft'))%>
   <p><em class="info"><%= l(:text_user_mail_option) %></em></p>
 <% end %>
 <p>
diff -r 2ca61e72c995 public/stylesheets/application.css
--- a/public/stylesheets/application.css	Mon Jul 30 01:32:31 2012 +0000
+++ b/public/stylesheets/application.css	Mon Jul 30 12:54:10 2012 -0400
@@ -413,8 +413,10 @@
 ul.projects { margin: 0; padding-left: 1em; }
 ul.projects.root { margin: 0;  padding: 0; }
 ul.projects ul.projects { border-left: 3px solid #e0e0e0; }
+ul.projects ul.mypage { border-left:none; }
 ul.projects li.root { list-style-type:none; margin-bottom: 1em; }
 ul.projects li.child { list-style-type:none; margin-top: 1em;}
+ul.projects li.mypage { margin:0; }
 ul.projects div.root a.project { font-family: "Trebuchet MS", Verdana, sans-serif; font-weight: bold; font-size: 16px; margin: 0 0 10px 0; }
 .my-project { padding-left: 18px; background: url(../images/fav.png) no-repeat 0 50%; }