There are a bunch of devices and associated techniques to perform a cric. Below I have posted videos of my favorite technique to perform a standard cric and needle cric. These are my preferred methods because they can be performed with items lying around any standard ED and don't rely on having any special equipment (ie jet ventilator, etc ...) - which often seems to go missing when needed most.
Bougie-Aided Standard Cric (hat tip to
EMCrit)
Needle Cricothyrotomy
Source
Video, Bougie Aided Standard Cricothyrotomy: http://www.youtube.com/watch?v=wVQFJR7qmrQ&feature=player_embedded
Video, Needle Cricothyrotomy: http://www.youtube.com/watch?v=Fq5YCpYTYUY
