yest nite found out a way to kill the Giants without any damage taken eventhough low level....was riding along the kaki bukit in front of whiterun, lure the giants to the Whiterun tower....since their size is so big, just stand in the tower and slowly plant your arrows into his body... and u get to upgrade ur Archery level as bonus....haha
of course i am doing this during my low level.....cant compare to you guys that can go one to one with the giant + mammoths.....
hehe