Found this this morning, that the Ubuntu 12.10 Login Screen Adds Remote Desktop Access. This basically means that you can set it up so that you are able to use the main desktop login screen to also do RDP/
VNC/etc/ICA/Vmware View remote logins to other systems.
The feature will allow you to enter a full-screen remote login without needing to login to Ubuntu itself, or install additional apps. It all happens ‘out of the box’.
Now, as if that wasn’t handy enough Canonical are also integrating Remote Login with the Ubuntu Single Sign On service.