diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index f33f6c3..c0e04db 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -412,4 +412,25 @@ module ApplicationHelper
     end
   end
 
+  def gravatar_url_for(email, options = {})
+    # Ta dando erro de roteamento
+    url_for( { :gravatar_id => Digest::MD5.hexdigest(email),
+               :host => 'www.gravatar.com',
+               :protocol => 'http://',
+               :only_path => false,
+               :controller => 'avatar.php'
+             }.merge(options) )
+  end
+    
+  def str_gravatar_url_for(email, options = {})
+    url = 'http://www.gravatar.com/avatar.php?gravatar_id=' +
+           Digest::MD5.hexdigest(email)
+    { :only_path => false }.merge(options).each { |k,v|
+      url += ( '&%s=%s' % [ k,v ] )
+    }
+    # we can set the default imgage with this:
+    # :default => 'DOMAIN/images/icons-app/gravatar-minor.gif'
+    url
+  end
+
 end
diff --git a/app/views/content_viewer/_comment.rhtml b/app/views/content_viewer/_comment.rhtml
index 8e8aee3..85a2b2a 100644
--- a/app/views/content_viewer/_comment.rhtml
+++ b/app/views/content_viewer/_comment.rhtml
@@ -1,11 +1,15 @@
-<div class="article-comment<%= ' comment-from-owner' if ( comment.author && (@page.profile.name == comment.author.name) ) %>">
+<div class="article-comment<%= ' comment-from-owner' if ( comment.author && (@page.profile.name == comment.author.name) ) %> comment-logged-<%= comment.author ? 'in' : 'out' %>">
   <% if comment.author %>
     <%= link_to content_tag( 'span', comment.author.name() ), comment.author.url,
         :class => 'comment-picture',
-        :style => 'background-image:url(%s)' % profile_icon(comment.author, :minor) %>
+        :style => 'background-image:url(%s)' % profile_icon(comment.author, :minor)
+    %>
   <% else %>
-    <%# unauthenticated user: display default icon %>
-    <%= content_tag('span', '&nbsp;', :class => 'comment-picture', :style => 'background-image: url(/images/icons-app/user_icon_size-minor.png)' )%>
+    <%# unauthenticated user: display gravatar icon %>
+    <%= content_tag 'span', '&nbsp;',
+        :class => 'comment-picture',
+        :style => 'background-image:url(%s)' % str_gravatar_url_for( comment.email, :size => 50 )
+    %>
   <% end %>
 
   <h4><%= comment.title %></h4>
@@ -13,6 +17,7 @@
     <%= _('By %{author} on %{date}') % {
         :author => comment.author ? link_to(comment.author.name, comment.author.url) : content_tag('u', comment.name),
         :date => show_time(comment.created_on) } %>
+    <%= '<br/>' + _('(unauthenticated user)') if ! comment.author %>
   </div>
   <div class="comment-text">
     <%= comment.body %>
diff --git a/public/designs/themes/default/stylesheets/blocks/main-block.css b/public/designs/themes/default/stylesheets/blocks/main-block.css
index 78b54de..e92442f 100644
--- a/public/designs/themes/default/stylesheets/blocks/main-block.css
+++ b/public/designs/themes/default/stylesheets/blocks/main-block.css
@@ -90,3 +90,8 @@
 .comment-text {
   clear: left;
 }
+
+.comment-logged-out .comment-text {
+  color: #888;
+}
+
--
libgit2 0.21.2