I've followed a few guides in order to enable XDMCP over VNC, however the end result is an ugly, if functional, default X login screen. It is not utilizing gdm for the authentication process, and I think it would look significantly more professional if it were.
This guide helped me the most: http://blog.sarah-happy.ca/2010/10/ubuntu-1010-vnc-login-screen.html
but I also used this guide as a reference: http://www.ibm.com/developerworks/opensource/library/os-multiuserloginsvnc/index.html?ca=drs-&utm_source=dlvr.it&utm_medium=twitter
I am using Fedora 17 Beta, and my goal is to be able to allow multiple users of a single host computer through VNC, with each user receiving a unique desktop that is independent of the other users. Therefore, when a new VNC session is started, it connects to XDM to allow them to login. Everything is working flawlessly except for the login screen looking like it's from the year 1980.