I would not support any such list to be public. It seems to me that bringing public suspicion over someone is already a bit condemning him. This is not wikilove at all, and prone to further heat conflicts.
Another solution could simply be to name two people ombudsmen over this topic. We should choose two people trusted by the community, BUT generally out of usual cabalistic discussions. Rather quiet and discreet people, not involved in current internal politics. These are most likely to be independant from those with the right to check the ips.
Ant
Secrecy checked by more secrecy. This is going in the wrong direction. A user should be notified some way when they are targeted for investigated.