I have a terrible slice as well.. I just started playing 2010, first time was on Father's Day..
Since then I've gone to the launch 2-3 times before the next Father's day, I have continued to do so until now but the slice is still there...
I've tried many things and what's confusing is I can use the irons with ease ( sometime I wish I could leave the drivers at home )
Also I'm a lefty playing hockey yet I bat and golf right.
So eventually I just stand facing away from the direction I slice but it's pretty daum awful when you slice the ball onto the other hole.