I have written an introduction to the Wikipedia:Requests for arbitration article. I suggest that all requests for arbitration be initiated by the posting of a request for arbitration on that page. Such a posting should not be made until mediation has been tried and failed. Not sure how that should be established.
I also posted this in the arbitration forum:
http://boards.wikimedia.org/viewtopic.php?p=7#7
Which parties interested in our arbitration procedures and proceeding might wish to use.
Fred