Even though anti-spoofing is just one aspect of the overall security of biometric system, it would be very interesting to learn which methods are stable in theory & practice.
The key is the sensor you use. They could be optical, capacitive, ultrasonic, piezo-electric, thermal, etc. The best advertized technology for liveness detection is multispectral from Lumidigm: http://www.lumidigm.com/liveness-detection/
An extensive academic study on liveness detection was done in PhD thesis by Martin Drahansky: