Wakari is much more than just "IPython notebook in the cloud"; however, we do have great support for it. For instance, we have just recently enabled a feature which lets you host & share your IPython notebooks: http://continuum.io/blog/ipython-notebook-sharing-in-wakari
Right now Wakari is in closed beta, meaning you have to register and we manually approve accounts (which we do very quickly).
Wakari is much more than just "IPython notebook in the cloud"; however, we do have great support for it. For instance, we have just recently enabled a feature which lets you host & share your IPython notebooks: http://continuum.io/blog/ipython-notebook-sharing-in-wakari
Right now Wakari is in closed beta, meaning you have to register and we manually approve accounts (which we do very quickly).