Notation for dance steps?

I think about possible notations for dance steps. This blog post is mainly a stub and it consists of a list of places on the web I want to check for their notations. I haven’t gotten very far though. I will try to elaborate on this topic a little further somewhen.

How to remember dance steps?

How can I remember dance steps? Is there a good notation system to build a website around it? Is a huge video database of annotated clips the better solution?