Curse voice is currently in beta and has a LOL overlay. It works by opening a link to chat with other people that have that link. It's free and easy to use. Would be great for team games with randoms who also use the mod. Sounds like it would be easy to mod. Any takers?
Hadn't heard of it before but looks really nifty. Would be good to have some community standard for voice chat which can match people without them needing to join specific channels or whatnot.