solenoid valves + arduino

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1217238977
http://www.arduino.cc/playground/Learning/SolenoidTutorial

http://www.mcmaster.com/#air-solenoid-valves/=9550fr
http://www.google.com/products?q=where+to+buy+air+solenoid+valve&aq=f

http://video.google.com/videoplay?docid=8889486602303878852#
http://vimeo.com/4620716