diff --git a/resources/images/id_card.png b/resources/images/id_card.png
new file mode 100644
index 0000000000..80ac5fda11
Binary files /dev/null and b/resources/images/id_card.png differ
diff --git a/src/calibre/gui2/tag_view.py b/src/calibre/gui2/tag_view.py
index 92ed3bca67..0a65b8da67 100644
--- a/src/calibre/gui2/tag_view.py
+++ b/src/calibre/gui2/tag_view.py
@@ -1588,6 +1588,9 @@ class TagsModel(QAbstractItemModel): # {{{
                     else:
                         prefix = ''
                     category = tag.category if key != 'news' else 'tag'
+                    if self.db.field_metadata[tag.category]['is_csp']:
+                        add_colon = True
+
                     if tag.name and tag.name[0] == u'\u2605': # char is a star. Assume rating
                         ans.append('%s%s:%s'%(prefix, category, len(tag.name)))
                     else:
@@ -1604,8 +1607,9 @@ class TagsModel(QAbstractItemModel): # {{{
                         n = name.replace(r'"', r'\"')
                         if name.startswith('.'):
                             n = '.' + n
-                        ans.append('%s%s:"=%s%s"'%(prefix, category,
-                                                '.' if use_prefix else '', n))
+                        ans.append('%s%s:"=%s%s%s"'%(prefix, category,
+                                                '.' if use_prefix else '', n,
+                                                ':' if add_colon else ''))
         return ans
 
     def find_item_node(self, key, txt, start_path, equals_match=False):
diff --git a/src/calibre/library/database2.py b/src/calibre/library/database2.py
index 556131b2c9..e72400a0bd 100644
--- a/src/calibre/library/database2.py
+++ b/src/calibre/library/database2.py
@@ -1493,6 +1493,34 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
             # No need for ICU here.
             categories['formats'].sort(key = lambda x:x.name)
 
+        # Now do identifiers. This works like formats
+        categories['identifiers'] = []
+        icon = None
+        if icon_map and 'identifiers' in icon_map:
+                icon = icon_map['identifiers']
+        for ident in self.conn.get('SELECT DISTINCT type FROM identifiers'):
+            ident = ident[0]
+            if ids is not None:
+                count = self.conn.get('''SELECT COUNT(book)
+                                       FROM identifiers
+                                       WHERE type="%s" AND
+                                       books_list_filter(book)'''%ident,
+                                       all=False)
+            else:
+                count = self.conn.get('''SELECT COUNT(id)
+                                       FROM identifiers
+                                       WHERE type="%s"'''%ident,
+                                       all=False)
+            if count > 0:
+                categories['identifiers'].append(Tag(ident, count=count, icon=icon,
+                                                 category='identifiers'))
+
+        if sort == 'popularity':
+            categories['identifiers'].sort(key=lambda x: x.count, reverse=True)
+        else: # no ratings exist to sort on
+            # No need for ICU here.
+            categories['identifiers'].sort(key = lambda x:x.name)
+
         #### Now do the user-defined categories. ####
         user_categories = dict.copy(self.clean_user_categories())
 
diff --git a/src/calibre/library/field_metadata.py b/src/calibre/library/field_metadata.py
index d89322954f..ff38af6890 100644
--- a/src/calibre/library/field_metadata.py
+++ b/src/calibre/library/field_metadata.py
@@ -16,7 +16,8 @@ class TagsIcons(dict):
     '''
 
     category_icons = ['authors', 'series', 'formats', 'publisher', 'rating',
-                      'news',    'tags',   'custom:', 'user:',     'search',]
+                      'news',    'tags',   'custom:', 'user:',     'search',
+                      'identifiers']
     def __init__(self, icon_dict):
         for a in self.category_icons:
             if a not in icon_dict:
@@ -24,16 +25,17 @@ class TagsIcons(dict):
             self[a] = icon_dict[a]
 
 category_icon_map = {
-                    'authors'   : 'user_profile.png',
-                    'series'    : 'series.png',
-                    'formats'   : 'book.png',
-                    'publisher' : 'publisher.png',
-                    'rating'    : 'rating.png',
-                    'news'      : 'news.png',
-                    'tags'      : 'tags.png',
-                    'custom:'   : 'column.png',
-                    'user:'     : 'tb_folder.png',
-                    'search'    : 'search.png'
+                    'authors'    : 'user_profile.png',
+                    'series'     : 'series.png',
+                    'formats'    : 'book.png',
+                    'publisher'  : 'publisher.png',
+                    'rating'     : 'rating.png',
+                    'news'       : 'news.png',
+                    'tags'       : 'tags.png',
+                    'custom:'    : 'column.png',
+                    'user:'      : 'tb_folder.png',
+                    'search'     : 'search.png',
+                    'identifiers': 'id_card.png'
             }
 
 
diff --git a/src/calibre/library/server/browse.py b/src/calibre/library/server/browse.py
index 0e132c7d11..585c1255a4 100644
--- a/src/calibre/library/server/browse.py
+++ b/src/calibre/library/server/browse.py
@@ -346,7 +346,7 @@ class BrowseServer(object):
         for category in sorted(categories, key=lambda x: sort_key(getter(x))):
             if len(categories[category]) == 0:
                 continue
-            if category == 'formats':
+            if category in ('formats', 'identifiers'):
                 continue
             meta = category_meta.get(category, None)
             if meta is None:
diff --git a/src/calibre/library/server/opds.py b/src/calibre/library/server/opds.py
index 72a802eaa9..e7fdffbbbb 100644
--- a/src/calibre/library/server/opds.py
+++ b/src/calibre/library/server/opds.py
@@ -580,7 +580,7 @@ class OPDSServer(object):
         for category in sorted(categories, key=lambda x: sort_key(getter(x))):
             if len(categories[category]) == 0:
                 continue
-            if category == 'formats':
+            if category in ('formats', 'identifiers'):
                 continue
             meta = category_meta.get(category, None)
             if meta is None: