Index: django/db/backends/postgresql/base.py
===================================================================
--- django/db/backends/postgresql/base.py	(revision 9477)
+++ django/db/backends/postgresql/base.py	(working copy)
@@ -5,6 +5,7 @@
 """
 
 from django.db.backends import *
+from django.db.backends.signals import connection_created
 from django.db.backends.postgresql.client import DatabaseClient
 from django.db.backends.postgresql.creation import DatabaseCreation
 from django.db.backends.postgresql.introspection import DatabaseIntrospection
@@ -113,6 +114,7 @@
                 conn_string += " port=%s" % settings.DATABASE_PORT
             self.connection = Database.connect(conn_string, **self.options)
             self.connection.set_isolation_level(1) # make transactions transparent to all cursors
+            connection_created.send(sender=self.__class__)
         cursor = self.connection.cursor()
         if set_tz:
             cursor.execute("SET TIME ZONE %s", [settings.TIME_ZONE])
Index: django/db/backends/sqlite3/base.py
===================================================================
--- django/db/backends/sqlite3/base.py	(revision 9477)
+++ django/db/backends/sqlite3/base.py	(working copy)
@@ -7,6 +7,7 @@
 """
 
 from django.db.backends import *
+from django.db.backends.signals import connection_created
 from django.db.backends.sqlite3.client import DatabaseClient
 from django.db.backends.sqlite3.creation import DatabaseCreation
 from django.db.backends.sqlite3.introspection import DatabaseIntrospection
@@ -147,6 +148,7 @@
             self.connection.create_function("django_extract", 2, _sqlite_extract)
             self.connection.create_function("django_date_trunc", 2, _sqlite_date_trunc)
             self.connection.create_function("regexp", 2, _sqlite_regexp)
+            connection_created.send(sender=self.__class__)
         return self.connection.cursor(factory=SQLiteCursorWrapper)
 
     def close(self):
Index: django/db/backends/mysql/base.py
===================================================================
--- django/db/backends/mysql/base.py	(revision 9477)
+++ django/db/backends/mysql/base.py	(working copy)
@@ -25,6 +25,7 @@
 from MySQLdb.constants import FIELD_TYPE, FLAG
 
 from django.db.backends import *
+from django.db.backends.signals import connection_created
 from django.db.backends.mysql.client import DatabaseClient
 from django.db.backends.mysql.creation import DatabaseCreation
 from django.db.backends.mysql.introspection import DatabaseIntrospection
@@ -262,6 +263,7 @@
             self.connection = Database.connect(**kwargs)
             self.connection.encoders[SafeUnicode] = self.connection.encoders[unicode]
             self.connection.encoders[SafeString] = self.connection.encoders[str]
+            connection_created.send(sender=self.__class__)
         cursor = CursorWrapper(self.connection.cursor())
         return cursor
 
Index: django/db/backends/oracle/base.py
===================================================================
--- django/db/backends/oracle/base.py	(revision 9477)
+++ django/db/backends/oracle/base.py	(working copy)
@@ -17,6 +17,7 @@
     raise ImproperlyConfigured("Error loading cx_Oracle module: %s" % e)
 
 from django.db.backends import *
+from django.db.backends.signals import connection_created
 from django.db.backends.oracle import query
 from django.db.backends.oracle.client import DatabaseClient
 from django.db.backends.oracle.creation import DatabaseCreation
@@ -274,6 +275,7 @@
                 # Django docs specify cx_Oracle version 4.3.1 or higher, but
                 # stmtcachesize is available only in 4.3.2 and up.
                 pass
+            connection_created.send(sender=self.__class__)
         if not cursor:
             cursor = FormatStylePlaceholderCursor(self.connection)
         # Default arraysize of 1 is highly sub-optimal.
Index: django/db/backends/signals.py
===================================================================
--- django/db/backends/signals.py	(revision 0)
+++ django/db/backends/signals.py	(revision 0)
@@ -0,0 +1,3 @@
+from django.dispatch import Signal
+
+connection_created = Signal()
Index: django/db/backends/postgresql_psycopg2/base.py
===================================================================
--- django/db/backends/postgresql_psycopg2/base.py	(revision 9477)
+++ django/db/backends/postgresql_psycopg2/base.py	(working copy)
@@ -5,6 +5,7 @@
 """
 
 from django.db.backends import *
+from django.db.backends.signals import connection_created
 from django.db.backends.postgresql.operations import DatabaseOperations as PostgresqlDatabaseOperations
 from django.db.backends.postgresql.client import DatabaseClient
 from django.db.backends.postgresql.creation import DatabaseCreation
@@ -84,6 +85,7 @@
             self.connection = Database.connect(conn_string, **self.options)
             self.connection.set_isolation_level(1) # make transactions transparent to all cursors
             self.connection.set_client_encoding('UTF8')
+            connection_created.send(sender=self.__class__)
         cursor = self.connection.cursor()
         cursor.tzinfo_factory = None
         if set_tz:
Index: tests/regressiontests/backends/tests.py
===================================================================
--- tests/regressiontests/backends/tests.py	(revision 0)
+++ tests/regressiontests/backends/tests.py	(revision 0)
@@ -0,0 +1,21 @@
+from django.db import connection
+from django.db.backends.signals import connection_created
+from django.conf import settings
+
+def connection_created_test(sender, **kwargs):
+    print 'connection_created signal' 
+
+__test__ = {'API_TESTS': ''}
+
+# Unfortunately with sqlite3 the in-memory test database cannot be 
+# closed, and so it cannot be re-opened during testing, and so we 
+# sadly disable this test for now.
+if settings.DATABASE_ENGINE != 'sqlite3':
+    __test__['API_TESTS'] += """
+>>> connection_created.connect(connection_created_test)
+>>> connection.close() # Ensure the connection is closed
+>>> cursor = connection.cursor()
+connection_created signal
+>>> connection_created.disconnect(connection_created_test)
+>>> cursor = connection.cursor()
+"""