No wonder, I was beating my head into a wall trying to figure that one out; anyway I uncommented those 3 lines and uploaded the file... I just hit "Calculate" with a proper zip code and the bar keeps scrolling indefinately. I tried it again in checkout and again it looks like it keeps going with no results... If the XML error is suppose to come on the checkout screen this make take a while. I still get the two errors in Firebug:

... but that does not seem to be that much help. Where should I go from here then?