Class notes, by date
01/18/08 01/23/08 01/25/08 01/28/08 01/30/08         02/01/08 02/04/08 02/11/08 02/15/08 02/18/08 02/20/08 02/22/08 02/25/08 02/27/08 02/29/08   03/07/08 03/10/08 03/12/08 03/14/08 03/17/08 03/19/08 03/31/08         04/02/08 04/04/08 04/07/08 04/09/08 04/11/08 04/14/08 04/16/08 04/18/08 04/21/08 04/23/08 04/25/08