http://duenos.net/article/111/ and "SizzlingKeys":http://duenos.net/article/119/, a lot of people use Adium. This popular iChat replacement is fully customizable instant messaging program that supports AIM, Bonjour, MSN, G-Talk, etc... In fact, I have no idea what most of those icons actually represent, but you can be assured that Adium does. I've been using Adium for years and love the way that it is integrated into OS X with so many visual styles and features. The only thing missing is video support. To learn more about Adium, go their "website":http://www.adiumx.com or to their "extras site":http://www.adiumxtras.com/. Also see other Killer Apps for Mac entries on "Sidenote":http://duenos.net/article/111/ and "SizzlingKeys":http://duenos.net/article/119/.