Some of the demos I’m writing started out as visual basic programs. I’ve started to move these across to Silverlight, C# and .NET now, but there are some that will not be converted for a while (in particular those that are no longer used in the teaching here).
In the meantime, you can find the old VB6 versions here:
http://www-users.york.ac.uk/~dajp1/Demos/index_VB.html
I won’t be writing any more VB demos.