notebook.community
Edit and run
There are several options for sharing IPython notebooks. The file itself is simply a JSON file which can be shared the same as any other file.
JSON
NBViewer (http://nbviewer.ipython.org) is a site which allows you to view and share notebooks.
Note: You cannot run your code at nbviewer, it simply shares a rendered notebook.
Wakari is a cloud-based hosting service for IPython Notebooks. It offers access via the browser or ssh. It also offers access to multiple terminal types:
http://wakari.io