Windows Server 2003 Terminal Services Rocks!
I was connected with XP Pro to a Windows 2003 Server via termserv, and I changed the IP address of my client without thinking or caring that I'd be knocked off the server. Yeah, except that it didn't happen. Somehow the server got word of my new address and went on happy as a clam. I swear that's a really hard thing to pull off. Awesome job, MS!