The UI with the svg "wiring" is awesome. You should consider abstracting away that functionality so that it can be reused by other projects.

Right now I'm imagining explainphys ;) where each term in a physics equation is explained e.g. The magnetic force felt by a particle of charge q moving with velocity \vec{v} in a magnetic field \vec{B} is

      \vec{F}_B =   q \vec{v} × \vec{B}
       |            |   |     |   |______magnetic field    
    magnetic force  |   |     |
                    |   |   cross
               charge   |   prod.
                        |
                   velocity of particle