I like "The Art of Ceramics with Robert Maxwell". It shows basic throwing skills, but he makes these weird little creatures out of the pieces he throws.
**Also, always a hit with my high schoolers... "Dale Chihuly over Venice". I realize its a glass blowing video, but it absolutely captivates them everytime. And in so many ways, glass is similar to ceramic... When they form their shapes they center, open, and shape the glass - just like clay. Younger children would be equally into his work as well - garaunteed.