From Breastfeeding USA, this is an excellent one page article explaining how to hand express.
This is a feature article from Breastfeeding Today, La Leche League's on-line magazine for mothers.
This 2 1/2minute video demonstrates how to hand express using a knitted breast & real mothers.
In this 7 1/2 minute video Dr Jane Morton explains how early hand expression can lead to improved milk production later on.