http://www.youtube.com/watch?v=S9MBqdME14I
at 3:09 you can see the giant's blow making a noticeable amount of damage, while at 4:40 the Dragon's ice breath (which should be a creature of much more stronger attacks) apparently does none.
I could be mistaken because of the PC's uber health regeneration, and even if it indeed is cold resistance I know it is a rather unimportant observation, but methinks that some speculation different from the Greaves debate and the Q&A waiting would be nice
Oh, and sorry if someone mentioned this before.