It's been a while.
Anyways, I was going through my server and found a damage calculator that I made for Mostly Harmless, (it helps to put down the Vampiric vs Sundering debate). I slapped a design on it and just hope someone could get some use out of it. PS, it doesn't blow chunks.
It's accurate in all the tests I've done.. here ya go:
Equation courtesy of SonOfRah
Guild Wars Damage Calculator
Guild Wars Damage Calculator
Narcism