For what it's worth: I have been using Subversion over HTTP with Kerberos for
quite a long time now -- it is fully enterprise-ready. It works from Unix and
Windows. I have been working with Ivan Zhakov and Lieven Govaerts on this.
I haven't experienced any issues on Windows, Linux, FreeBSD with that.
Moreover, I am preparinga guide how to make it all work with Subversion.
Subversion over SASL with GSS-API is a problem (svn://). Subverion's SASL
support needs to be improved first, second Cyrus SASL does not support SSPI on
Windows. So one needs to write a SSPI plugin which implements the mechs GSSAPI