WOW, really? An "ignore" button?
You mean they can't post on your thread? Or they can't PM you?
Hmm..I could see that getting potentially abusive? Especially if someone winds up forming "alliances" and all of them "ignoring" someone they don't like for the silliest of reasons, like...someone's signature line?
How does/would that work? Why not just ignore the person without a button?
I think it's a bad idea--a way to introduce resentment between members, IMO.