Here is an example of the built virtual machine that is built by the attached scripts without user intervention:
http://www.stp.dias.ie/~vbraun/Sage/Sage-4.7.rc2.ova
The virtual machine starts up in text mode and automatically runs the Sage notebook server. At first startup you are prompted to enter a password, as usual. Once you set up your admin password you have to use your host OS web browser to open http://localhost:8000
.
At this point it would be nice if somebody could try it out on a windows machine (or any other machine).