For all those of you who may be late to the game, Blizzard is adding RSS feeds to the Armory. Basically, the Armory will now report on the exact time you do an "Armory worthy" activity, such as boss kills, achievements, item pickups, and more. People can subscribe to your RSS feed, so then they know exactly when you do something in World of Warcraft.
This has, of course, sent privacy advocates into a tailspin of anger. There's no opt-out button for the Armory, so your playing style in World of Warcraft is going to be exposed whether you like it or not. The topic has even spawned a 59+ page thread on the European forums!