I have previously spoken to many clan leaders/admins regarding the sharing of ban lists, these though need only to be of proven cheaters through submitted demos and not for abusing admins or xp whoring, these are individual server issues.
We are in the process of setting up a site where any one can submit demo's of suspected cheaters, these will then go in front of a cheat buster panel for their opinion, if their opinion is unanimous then the player details will be published, if not then no action will be taken against them. This is how we currently run our system for cheat busting, it does give the benefit of doubt to the player but we want to rid the game of cheaters and not ruin the game for all.
We will openly share our ban lists of proven cheaters to any willing clan and welcome the participation is this from all.

I did pm the topic creator with my opinion of the player in question, this is solely my opinion and is not a representation of our clans view of this player has I am not one of our cheat busters.