That being said, I much prefer not to have an ignore function. I hate it, quite frankly. Good moderation also should make ignoring stupid or trollish posters redundant, as they will be dealt with by the moderation staff.
I agree. Ignore functions do not serve to improve the quality of debate instead they simply fragment the debate that does occur. They may be worthwhile on larger sites, but EvC is relatively small.
I've never seen a public ignore feature.