Synergy is a great program to control multiple computers with a single keyboard and mouse. It is much more useful when configured to autostart on your client machines.
Ubuntu 11.10 Autostart:
$ emacs /etc/lightdm/lightdm.conf
Append the following to the end of the file:
*Note: insert your own IP address or computer name.
Ubuntu 11.10 GNOME:
Simply use the Startup Applications Program to add the synergyc [IP ADDRESS] command. Found in Applications -> Other ->Startup Applications.