I've added a few more animations since my last post.  They can be accessed
at

http://www.tlhiv.org/animations

There is one in particular that, I think, is quite impressive.  It is an
animation of a function f(x,y,t) where t is time.  It is available at the
aforementioned link or directly at

http://www.tlhiv.org/animations/nocgi/function_surface.html

Troy