Released in October 22, 2009. The zOMG! Voice Chat is a downloaded voice chat that is used in the zOMG! MMO for people who group battle and want to communicate in real time without the use of a keyboard.
copied verbatim from announcement
Teamwork in zOMG! just got easier: now you can chat with your crewmates using your mouth and a microphone instead of just flailing your hands against a keyboard and hoping for the best. All you have to do is click the little banner in the zOMG! World List to activate, then hop in the game and join a crew. After that, you can speak freely into your microphone, coordinating attacks, buffs, and so on with your allies.
This feature is totally opt-in and only works amongst crewmates, so you don't have to worry about overhearing random hoots and hollers while you're trying to get your important monster-smiting work done.