Very cool. There are native IPython notebook kernels for Python, Julia [1], R [2], Haskell [3] and now Erlang. Which is why the project is being made even more language-agnostic and being renamed as Jupyter [4].
[1] https://github.com/JuliaLang/IJulia.jl
[2] https://github.com/takluyver/IRkernel