Like jQuery's .one but runs only once, across multiple elements and/or event types.

jquery.ba-oneonly.js

/*!
 * jQuery oneOnly - v0.1pre - 03/30/2011
 * http://benalman.com/
 * 
 * Copyright (c) 2011 "Cowboy" Ben Alman
 * Dual licensed under the MIT and GPL licenses.
 * http://benalman.com/about/license/
 */

(function($){

  $.fn.oneOnly = function( types ) {
    var elems = this,
        args = Array.prototype.slice.call(arguments),
        fn = args.pop();

    function handler() {
      elems.unbind(types, handler);
      return fn.apply(this, arguments);
    }

    return this.bind.apply(this, args.concat(handler));
  };

})(jQuery);

Usage: http://jsfiddle.net/cowboy/BfDej/