There is WAY too much confusion about the differences between blood spinning and blood doping. Put simply, blood spinning is the separation of the whole blood into its components: red blood cells, white blood cells, platelets and plasma. Various techniques concentrate the components and then are used either individually or in combination. Platelet rich plasma can be the product of blood spinning. It is used immediately after preparation and for injuries.
Blood Doping is the collection and storage of typically whole blood to be used to enhance performance. Blood is drawn, stored and then reinjected at later date typically right before a race to improve endurance. Cyclist Floyd Lanis has recently admitted to blood doping and accused Lance Armstrong of the same.
Gwen Knapp of the San Francisco Chronicle discusses these issues in conjunction with Dr. Tony Galea a Canadian doctor who has treated Tiger Woods and several other US athletes. Read her article here.