diff --git a/cms/models.py b/cms/models.py
index 6db4fc4..a90c59f 100644
--- a/cms/models.py
+++ b/cms/models.py
@@ -144,6 +144,7 @@ class Post (models.Model, Routable):
     content = models.TextField (
         _('description'),
         default = '',
+        blank = True, null = True,
     )
     image = models.ImageField(
         blank = True, null = True,
diff --git a/cms/sections.py b/cms/sections.py
index abd164c..3cd06b9 100644
--- a/cms/sections.py
+++ b/cms/sections.py
@@ -317,6 +317,28 @@ class List(Section):
         return self.paginate_by and self.paginate_by < len(self.object_list)
 
 
+class Similar(List):
+    """
+    Section that uses tags to render similar objects of a given one.
+    Note that the list is not a queryset, but the sorted result of
+    taggit's similar_objects function.
+    """
+    title = _('Similar publications')
+    models = None
+    """
+    List of models allowed in the resulting list. If not set, all models
+    are available.
+    """
+
+    def get_object_list(self):
+        if not self.object:
+            return
+
+        qs = self.object.tags.similar_objects()
+        qs.sort(key = lambda post: post.date, reverse=True)
+        return qs
+
+
 class Comments(List):
     """
     Section used to render comment form and comments list. It renders the
diff --git a/notes.md b/notes.md
index eb808a5..6290fae 100644
--- a/notes.md
+++ b/notes.md
@@ -5,21 +5,17 @@
 # TODO:
 - general:
     - timezone shit
+    - translation
 
 - programs:
-    - schedule:
-        - (old) schedule.to_string unused? commented
-        - write more tests
-    - sounds:
-        - check that a sound is available when uploading too
-        - one sound, one diffusion
-          -> sound_monitor
-          -> liquidsoap
-          -> tests: sound_monitor, liquidsoap (monitor)
+    - tests:
+        - sound_monitor
 
 - liquidsoap:
     - update rc's supervisor scripts
-    - check when a played sound has a temp blank
+    - tests:
+        - monitor
+        - check when a played sound has a temp blank
 
 - cms:
     - empty content -> empty string
@@ -33,7 +29,6 @@
     - admin cms
     - content management -> do we use a markup language?
     - sections:
-        - similar articles (using tags)
         - calendar
         - article list with the focus
             -> set html attribute based on values that are public