Everybody seems to "know" that this repository is not maintained by nvidia and some even claim it shouldn't be.
However, the URL of the repository is http://download.nvidia.com/opensuse/11.1
(as displayed in the Yast system management tool)
I think this indicates that it at least resides on an Nvidia server.
It is a bit difficult to browse around on the download.nvidia.com server because it acts strangely on http requests, but from another reply above I see it is possible to do it using FTP. Thanks.