I was just doing something tonight and got fed up calculating these values with a calculator so I wrote a little program to do it.
www.webtreatz.com/resources/FieldOfView.exe
Save it to disk and run it. You enter the pixelsize and the number of pixels wide/high of your CCD (get that from the manual if you don't know) and the focal length of your telescope and it will tell you the Field of View of the combination and the all important 'Arcseconds Per Pixel' value.
(If it doesn't run on your computer, you would need to install the microsoft .net framework.)
Thats all it does just nice and simple.
  