Peter from Brussels has compiled quite a collection of Tango Steps & Figures that are somewhere explained on the web. He also tried to visualize those steps on paper but came to the conclusion that motion on the floor with 4 legs is much too complicated for a simple drawing - haven’t we all 
Hi Daniel,
I’m still on my quest for useful tango information. I just added a glossary to the site and am enhancing the ‘STEPS’ directory as we speak. I’m adding pictures, step descriptions, graphs, quotes, … whatever adds to the understanding of a beginning/intermediate dancer.
Check this: http://tango.forret.com/tango/steps/?figure=basico
We seem to have similar interests, I’m also working on a folksonomy/tagging project for the moment.
Stay in shape!
Peter