thanks for the info... the website I first saw this on had it as a level 1 spell and not the top of the talent tree.
I've been thinking of converting one of my pally to holy and if I do I'm sure this will be a great help.

so far I've been able to passively heal my way though dungeons with just divine storm on 4 ret pallys... maybe I'll dual spect the 4th and give it a try.