One interesting thing I notice about the photos, Doug, is that the ICE program had to really crank the brightness on some of those photos to get them all to match up.

You'll notice an area near the left-middle of the composite image that seems to be behind a grayish haze. That's the darkest of the pictures having to have its brightness increased to match the other photos so that they merge properly.

The ICE program did the best it could with the source material it was given, so it's pretty impressive. But for future panorama photos, assuming you're the guy taking the pictures, the best results will be obtained if you can exposure-lock the camera as you're taking the photos. That way all images will be the same exposure and the blending of the images will come out even better.

Some cameras come with a built-in panorama mode, and the exposure locking is one of the things that the panorama mode does.