FordDoctor I use gizmo's chat integrated into my forum boards. It is the pjirc script and it integrates well into my forums. I run my own IRC server/sevices (because I am paranoid of using big name IRC's etc) and it works great as a customer support channel. As for integrating it in as a need to turn on or turn off I agree with Gizmo, it really depends on your individual usage. There are other ways to get the same thing (i.e. your flash chat or even the naked shoutbox).
