Check out this URL for best practices for SSIS
http://sqlcat.com/sqlcat/b/top10lists/archive/2008/10/01/top-10-sql-server-integration-services-best-practices.aspx
http://sqlcat.com/sqlcat/b/top10lists/archive/2008/10/01/top-10-sql-server-integration-services-best-practices.aspx