I managed to raise the frost resistance of my mage to 100, hoping I'd not take any damage when casting Blizzard. But in the end, I still take some damage form this spell even with max frost protection.

Anyone know why? Does Blizzard deal some damage other than frost? What you guys do to not die for your own spell?

I never have any real trouble as long as I don't move and stay in the "eye" of the spell; I get a little bit of damage but not much. When I move into the wind is where the trouble starts.

Blizzard has a whirlwind effect, so that extra damage is stuff getting caught in the wind and smacking you.