In the social frame, there is a place to set your status which is then broadcast to your RealID friends. Just as one may use Twitter to update friends on one's daily activities, this addon uses this RealID status in the same manner - except it will do it for you automatically. There are plenty of choices for events to broadcast to your friends, such as getting epic loot, winning a battleground, or killing a raid boss. You can pick and choose which type of events to broadcast as well as whether you wish to broadcast to your guild chat as well. The author is also open to suggestions on new types of events to track.
Let your RealID friends in on what you're up to and download the addon here.
Are you the author of a mod that you think belongs in this spotlight? Just upload/update it to WoWInterface, and it will automatically be considered for that week's Pick.
"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh