educational video clips

A couple days back, prodikal posted a link for a movie called Warriors of the net .

Though I already knew how tcp/ip and the like works, I found it very helpful to see it visually.
I had my teacher show it in our Cisco class and it helped everyone tie up loose ends.

What I am wondering is,

Where can I find more video clips that show how various types of technology, etc. work?

I read many books but I have to leave it up to my imagination on how to interpret what I have read.

Sometimes, I don't get it and I think that a visual is very good to help understand.

I have already done some searching, but didn't really find much.

I just thought if any of you have come across clips like this, you could post a link.

Thanks everyone!