SELECT OBJECT_NAME(id) FROM syscomments WHERE [text] LIKE '%your_search_here%' AND OBJECTPROPERTY(id, 'IsTrigger') = 1 GROUP BY OBJECT_NAME(id)
SELECT ROUTINE_NAME, ROUTINE_DEFINITION
FROM INFORMATION_SCHEMA.ROUTINES
WHERE ROUTINE_DEFINITION LIKE '%foobar%'
AND ROUTINE_TYPE='PROCEDURE'http://databases.aspfaq.com/database/how-do-i-find-a-stored-procedure-containing-text.html
http://www.sharpdeveloper.net/content/archive/2007/06/26/search-trigger-text-sql-server-2005.aspx