This plugin adds private messaging between users, and allow users to receive notfications about new messages, view conversations, reply to other users, It includes nice features such as emoticons, nice ajax notifications, easy conversations and quick-reply.
Demo: http://bit.ly/1NgRExy
http://bit.ly/1Sok8W9
http://bit.ly/1NgRDcS
http://bit.ly/1Sok6xr
http://bit.ly/1NgRExB
http://bit.ly/1Sok8Wb
http://bit.ly/1NgRExE
http://bit.ly/1Sok8Wd
http://bit.ly/1NgRDcU
http://bit.ly/1Sok8Wf