This is quite a short video on Snake Arms but I wanted to introduce you to someone I found through Twitter (if you use Twitter then follow me at (http://twitter.com/bellydancing). VelvetMoxie on Twitter has a website called The Gypsy Kiss where she has a number of tutorial videos - some showing basic belly dance moves and others showing how to do Tribal makeup and costuming. These videos have also been posted on Youtube so I may feature some more in the future but in the meantime you can head over to her website and take a look at: http://www.thegypsykiss.com/
Here is the video:
Focus on moving each part of the arm in the order described - at first it will seem quite stuttery, but once you have the movement you will be able to create a fluid motion.