Bukkit

Sometimes when no member of the server staff is online users detect griefing activities at their own or others' houses.

But what happens when an admin or someone who may use HawkEye comes on, the user who saw the griefing left and the staff member doesn't see the griefing?
Nothing.

Wouldn't it be good to add a feature to HawkEye where users and moderators can go to the place of the grief and report it by HawkEye to the admins when they are not online? I think so...

This could be done by a command or by placing a sign. When using the command it could also place the sign in front of the player. So anybody can see this grief has already been reported.
Eventually they also could leave a comment on the sign regardless of which method they used to report.

When an admin/HawkEye-privileged user comes on it would display him a list of reported griefs that he should rollback. He selects a report and can teleport to the palce where the grief was reported.

This is probably better handled by another plugin, HawkEye is designed to log data.