My site currently uses Volusion live chat but honestly, it sucks, since I need to run the tool and sit in front of it all day long. I'd like something more mobile where I can respond to chat inquiries from anywhere.
Google Talk has an official chatback badge but it would be nice to have something a little more...professional?
I'm not big enough to need multi user support or anything. I'm all by my lonesome :)
Also see these older discussions for helpful ideas and things to think of:
Nick since you're looking for something simple, you may also check http://www.plugoo.com/ It's free and integrates well with Gtalk. I have been using it for quite sometime and it works well for me.
Also check this article on embedding chat solutions within website You will find lot of options there.
I do not know of an live customer support tool which integrates with an current IM platform. I do know that there are those that have a blend of platform options that free you from sitting in front of your computer.
Our company's live chat platform has both an Android and iPhone Application which allows you to be logged onto your site's live customer chat from your smart phone where ever you are. Both can run in the background. I have had Google talk, the IM aggregate "trillian" and our live customer support tool all running on my phone at the same time with no problem.
Warning : the option of being available at all times anywhere has signifant costs to personal relationships.