Windows Terminal Server Replacement?

Evanrude asks: "In my never ending quest to eliminate the Windows operating system from my life, I have yet to find a Linux replacement for the Windows Terminal Server product/service. I have come across the Linux Terminal Server Project but from everything I have read about it, you must boot a diskless workstation to use it, there is no client to connect to it from say a remote workstation [read: internet or remote VPN client]. There is also the Citrix Metaframe Presentation Server for Unix, but I am really looking for something that will run on Linux. I have also googled for anything related to Linux and the Remote Desktop Protocol, but have not had good luck. Has anyone had any experience with replacing a Windows Terminal Server with something Linux based or know of any other projects that might be more on track with this than the LTSP?"