For fun this afternoon I decided to get VNC running between my laptop and my MP3 server so I can control the machine from anywhere in my place. I was expecting at least a few hours of work; I was not expecting it to take approx. six minutes. Assuming you're running at least 10.1.5, these are the steps:

1. Install this on the Mac you want to control: Share My Desktop
2. Install this on the Mac to control from: VNCThing
3. There is no step 3.

I love X.