SQL Server 2005: T-SQL to temporarily disable a trigger

DISABLE TRIGGER { [ schema_name . ] trigger_name [ ,...n ] | ALL }
ON { object_name | DATABASE | ALL SERVER } [ ; ]

http://msdn.microsoft.com/en-us/library/ms189748(SQL.90).aspx

followed by the inverse:

ENABLE TRIGGER { [ schema_name . ] trigger_name [ ,...n ] | ALL }
ON { object_name | DATABASE | ALL SERVER } [ ; ]

http://msdn.microsoft.com/en-us/library/ms182706(SQL.90).aspx