Xfire
TS and Vent are ftw, but what do you expect, programs specifically designed for Chat!
I'm not much of a fan of teamspeak anymore. I run a ventrilo server for myself and a group of my friends. It origonally was a teamspeak server. And while the teamspeak server was easier to set up, ventrilo wins over all.
I mean, you can have binds for text to speach, binds for recording conversations, you can set individual volume levels for each person on the server (quite easily the thing that won me over.) And there's a much larger variety of codecs that you can pick.
Not to mention the program is a little bit less intensive on the reasorses, and the server can be set to run as a service within windows. I don't even need to log onto my vent server computer in order for it to be up. I just turn it on, and as soon as it's ready for a user to log on, the server is already running in the background.