x11vnc - a VNC Server to your real X display!

I use x11VNC which lets you run a VNC server on your current working X display. I am not sure if there is any other VNC server which allows that on Linux.

To install on Ubuntu

sudo apt-get install x11vnc

Run x11vnc

x11vnc -rfbauth ~/.vnc/passwd -forever -display :0&

Which means - To use your vnc password at ~/.vnc/passwd (Created using vncpasswd), run forever (else it will stop after the first client disconnect) and run on display :0