http://www.sqlservercentral.com/Forums/Topic1168030-9-1.aspx

--ADD SQL OBJECTS(TABLES, VIEWS, SPS, UDFS ET AL) TO ALL THE DATABASES ON THE SERVER. 

PRINT '##### BEGIN DB SCRIPT ##### '
EXEC SP_MSFOREACHDB 
'USE [?]IF ''?'' NOT IN (''MASTER'', ''MODEL'', ''MSDB'', ''TEMPDB'', ''ADVENTUREWORKS'' )
BEGIN
IF NOT EXISTS
(SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = ''MYTABLE'')
BEGIN
CREATE TABLE [DBO].[MYTABLE](COLUMN_1 VARCHAR(50) NULL, COLUMN_2 DATETIME NULL)
PRINT '' TABLE CREATED IN DATABASE ('' + DB_NAME() + '')''
END
ELSE
PRINT '' TABLE PRESENT IN DATABASE ('' + DB_NAME() + '')''
END '
PRINT '##### DB SCRIPT COMPLETED #####'