This addon provides a real-time updated set of buttons, each representing your Real ID friends that are online.
With a simple Left click, your friend is immediately invited to party/raid, rather than having to do all that hard work (:)) and open your friends list to invite them manually, much like how it's done in Diablo 3's Character Screen.
A Right click would in turn toggle chat to Whisper that player.
Any feedback or suggestions for improvement are very welcome.
Enjoy.