Our good friends at Johnson County Med-Act produced some great videos showing both the end tidal CO2 Colorimetric device in action as well as capnography and capnometry.  Take a look:

End Tidal CO2 Capnometer
http://www.youtube.com/watch?v=FwQTXPj4cpo&feature=related

Capnometer/Capnograph
http://www.youtube.com/watch?v=KJk1i8Upd5s&feature=related
http://www.youtube.com/watch?v=sLLHrj_pFys&feature=related

There are numerous videos posted here.  You’ll know them as they are posted by “ttems”  Thanks to JoCo for sharing these!