Many administrators have missed that there is a "hidden" third connection that can be made to Windows Server 2003 servers. I often work with system administrators that are swearing in their cubes because the two admin connections are used up and they can't connect. I ask them why they don't just connect to the console session and boot them? Console session? Huh?
It's pretty easy, and I actually modify my RDP shortcuts to always connect to the console session so that I never conflict with anyone. Here's how it works:
MSTSC /v:<name or IP of the server> /console
This basically uses session 0 or the console session. So, if someone is standing in fron of the monitor connected to the server, it will say locked as you work away (much like Remote Desktop in Windows XP).