I bet you saw the image and went what the?
Pre-cata Silithus was, and still is, my favourite leveling zone. I would spend so much time down there, doing the Wind Stone lords and grinding out carapaces for the Sceptre of AQ questline to get reputation with the Brood of Nozdormu.
If you never did the Wind Stone Lords, check out this article from WoW-wiki – http://www.wowwiki.com/Wind_stone
Unfortunately they took out this feature. I don’t know why either because the stones are still there and it isn’t connected to the AQ sceptre quest. Oh well, I’ll just have to content myself with the memories of running around, and of my guildie killing himself from touching the Wind Stone endlessly (it damaged you every time you interacted with it).