Plus to damage experiment

[Xanthix]

I've also noticed there are slight variations in the wording on some of the +spell damage mods:

Example: +4 to Nature Spell damage vs Up to +19 damage to fire damage.
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I agree with playingtokrush that you shouldn't read too much into this. For healing, you have "+3 Healing," "+6 to Healing Spells," "+1-16 to Healing," etc. And they all do the same thing: nothing useful. :)

I was under the impression from other posts that +spell damage mods were less useful than they appeared because the proportion of damage added was pretty small relative to their level requirements.

Theoretically you could stack spell damage from numerous different pieces of equipment, but I'd like to know if it worth the effort to do so.
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Nearly all +damage/healing mods are useless, because of the level requirements, because of the other stat bonuses you must give up to get them, and because right now +healing mods only work on self-heals.

There are some of these mods on high-level purple and set items, along with stat bonuses, but otherwise they are really nothing to aim for.