I've used cpanel before, but what are the other types of control panels out there? Does anyone have demos of them so I can check them out?

Ensim, http://www.ensim.com/

Plesk, http://www.plesk.com/

H-Sphere, http://www.psoft.net/

Simple Cp, http://www.simplecp.com/

HostGUI, http://www.hostgui.com/