I've been using the "Arsenal 2" camera assistant and I must confess that I've only scratched the surface. The tool provides wonderful capabilities in photo stacking, color in low light conditions, creating panoramas, time lapse and a bit more.
The also does something really cool. If your taking a picture and there are a lot of people around, through photo stacking, the tool recognizes moving objects and then is able from the 'stack', create a picture that has those moving objects removed.
The above panorama was taken in Ireland. It was a gray overcast day; but the clouds were breaking up for the moment and the sun was beginning to shine through.