Dave Prior explains the concept of a product backlog.
Videos on Scrum and Agile Project Management
A basic presentation of Scrum by Ken Schwaber.
The presentation shows the usage of the agile and Scrum methods for software projects in highly dynamic and fast changing environment. It describes how to adapt Scrum process to extremely short delivery times counted for days. Such Scrum process was practically used and proved on small web-based application development. Typical delivery time is 3-5days.