Fred Bauder said:
The Arbitration Committee could create its own notice board and may, but is best contacted now by either posting on the individual arbitrators' talk pages or by a note on Wikipedia:Requests for arbitration.
I've taken up David Gerard's suggestion (made here I think but also on [[Wikipedia talk:Requests for arbitration]]) to make a concise (oh well, I did my best) formal requestion on [[WP:RfAr]].