I recently saw the ads for Yoplait Lactose Free Yoghurt.  Being 
skeptical, but interested, I waited til the weekend to try it - just in 
case of side-effects, I wanted to be home.
I am pleasantly surprised to say that I have consumed a little container 
of it - 6 oz. I think - completely without symptoms.  By now, if there 
were more than a trace, I'd be having symptoms, as I'm pretty intolerant.
My wife tasted it and says it's as good as the regular Yoplait - never 
having been able to taste it, I'll take her word for it.  Not quite as 
lite as their "light" which she eats, but not too bad either.

I also tried Lactaid Yoghurt.  While I also/still/yet have no symptoms, 
the flavor and the consistency of that yoghurt aren't as good as the 
Yoplait is.  Still they both beat the hell out of the taste of the 
Soy-gurts I've tried.  IMO

Yoplait comes in the 6 oz. container and in a 4-pack of 4 oz.; and in 
multiple flavors.  Lactaid comes in 6 oz. containers, and I think only 3 
flavors.
FWIW