Add ActorListFilter to filter by actor type. Add description column to display.

actstream/admin.py

 from django.contrib import admin
+from django.contrib.admin import SimpleListFilter
+from django.contrib.contenttypes.models import ContentType
+from django.contrib.auth.models import User
+from django.utils.translation import ugettext_lazy as _
 
 from actstream import models
 
@@ -9,10 +13,53 @@ except ImportError:
     ModelAdmin = admin.ModelAdmin
 
 
+class ActorListFilter(SimpleListFilter):
+    # Human-readable title which will be displayed in the
+    # right admin sidebar just above the filter options.
+    title = _('actor type')
+
+    # Parameter for the filter that will be used in the URL query.
+    parameter_name = 'actor_type'
+
+    def lookups(self, request, model_admin):
+        """
+        Returns a list of tuples. The first element in each
+        tuple is the coded value for the option that will
+        appear in the URL query. The second element is the
+        human-readable name for the option that will appear
+        in the right sidebar.
+        """
+        return (
+            ('non-staff', _('All excluding staff')),
+            ('anonymous', _('Anonymous users')),
+            ('registered', _('Registered users')),
+            ('staff', _('Staff')),
+        )
+
+    def queryset(self, request, queryset):
+        """
+        Returns the filtered queryset based on the value
+        provided in the query string and retrievable via
+        `self.value()`.
+        """
+        # Compare the requested value (either '80s' or 'other')
+        # to decide how to filter the queryset.
+        user_content_type = ContentType.objects.get_for_model(User)
+        staff = User.objects.filter(is_staff=True)
+        if self.value() == 'non-staff':
+            return queryset.exclude(actor_content_type=user_content_type, actor_object_id__in=staff)
+        if self.value() == 'anonymous':
+            return queryset.exclude(actor_content_type=user_content_type)
+        if self.value() == 'registered':
+            return queryset.filter(actor_content_type=user_content_type).exclude(actor_object_id__in=staff)
+        if self.value() == 'staff':
+            return queryset.filter(actor_content_type=user_content_type, actor_object_id__in=staff)
+
+
 class ActionAdmin(ModelAdmin):
     date_hierarchy = 'timestamp'
-    list_display = ('actor', 'verb', 'action_object_content_type', 'action_object', 'target_content_type', 'target', 'timestamp')
-    list_filter = ('verb', 'timestamp')
+    list_display = ('actor', 'verb', 'description', 'action_object_content_type', 'action_object', 'target_content_type', 'target', 'timestamp')
+    list_filter = (ActorListFilter, 'timestamp', 'verb')
     raw_id_fields = ('actor_content_type', 'target_content_type',
                      'action_object_content_type')