Hmm, interesting to see this.
I suppose these makes sense, really.
Here it might be good to include some suggested poisons and diseases, or at least reference the BoED ones (whether to condemn or praise them, I am not sure ).
Maybe belt-and-suspenders logic? I suspect 3.5's type system wasn't put together very rigorously.
Now this, I really like.
These are all fairly intuitive, although it might be interesting to know why immunity to ability damage was granted in the first place....
Perhaps it's the whole "Dungeons" thing.
It occurs to me that (greater) restoration could be used to inflict positive levels on undead.