Ventrilo, or 'vent', is as easy as downloading a client and having a mic and speakers once a server is enabled. Typically the servers can run 50-100 people in an almost forum type of format. Main lobby, sub lobbies, etc. So in essence - you could have a lobby for each section of eplaya with individual areas for each thread.. not that youd want to - but it can offer that much flexibility.
It has been refined by its use by gamers. One good thing to come out of the whole gamer thing, IMHO. Check it out - no account or personal info required - just a headset typically.
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