Hello i am planning some awesome things to add to Junkmanuk original plugin. However this is a side project.
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Use WorldGuard regions to create private chat spaces. Only players within the same region will be able to hear your conversation.
Features Simple integration into WorldGuard/WorldEdit Configurable chat color Configurable chat formatting Create private meeting places, find out who can hear you Permissions

Setup

WorldGuard is required for this plugin to work.

Commands

/rc canhear Display a list of players who can currently hear you talking
/rc public <region name> Mark the given region as public chat (deactivate region chat)
/rc private <region name> Mark the given region as private chat (activate region chat)

Permissions

Basic permissions:

rc.* Can apply RegionChat to all regions rc.own.* Can apply RegionChat to regions where player is owner

Full permissions:

rc.canhear Can display players within earshot
rc.own.public Can set owned region as public
rc.own.private Can set owned region as private
rc.private Can set any region as private chat region
rc.public Can set any region as public chat region

Original Source Code: https://github.com/junkmanuk/JunksRegionChat
Original Plugin Page: http://dev.bukkit.org/bukkit-plugins/junksregionchat/