Ah, OK, that explains it! Yeah, I use PhotoMatix as well. I've used as many as 5 or 7 exposures, depending on the severity of the range I'm trying to bring out.
Good tip about how to include the opeople... wouldn't have thought of that. So in the other two frames they're not in the photos at all, or you fired the three frames very rapidly so they're only slightly 'out of phase' with each other?
Thanks again!