Quote Originally Posted by 'Fursphere',index.php?page=Thread&postID=164512#po st164512
Quote Originally Posted by 'Hachoo',index.php?page=Thread&postID=164502#post1 64502
Welcome to 3.0. Mana spring has stacked since before WoTLK.
Actaully, it didn't stack Pre-Wotlk. It does now though.

But it only affects your group. It won't effect other groups within a raid.

So if you're raiding, it might be beneficial to spread your Shaman out a little.
I'm pretty sure it started stacking in 3.0 which came out about a month before WoTLK.