Here are a few websites that may contain some useful materials for the Manager and Coach, whether it be how to structure a practice, or advice on maintaining a positive environment for the players. (Many of them are supported by advertising.)

http://www.littleleague.org/managersandcoaches/Coach_Resource_Center.htm
http://www.positivecoach.org
http://www.qcbaseball.com
http://www.baseball-excellence.com