Mar 4th 2010 5:00PM Pretty sure I'm going to win this.
Jan 6th 2009 2:58PM Get ShockandAwe its a mod written by Levva who does a lot theorycrafting on enhance shaman. Here's a link to her FAQ on MMO Champion.
Jul 23rd 2008 2:22PM "The tooltip states When you critically hit with a melee weapon, you reduce the cast time of your next Lightning Bolt, Chain Lightning or Lava Burst spell by 20%. Stacks up to 5 times. Lasts 15 seconds. So if I'm reading it correctly, a five stack of Maelstrom Weapon would allow you to cast an instant LB, CL or Lava Burst."
That is the tooltip for the Rank 5; each rank increased it 4% for a total of 20% reduced cast time.