jQuery liveOne: The power of .live and .one, together at last! (NOT FULLY TESTED) see http://jsfiddle.net/cowboy/gjcSE/

jquery.ba-liveone.js

/*!
 * jQuery liveOne - v0.1 - 07/30/2010
 * http://benalman.com/
 * 
 * Copyright (c) 2010 "Cowboy" Ben Alman
 * Dual licensed under the MIT and GPL licenses.
 * http://benalman.com/about/license/
 */

// The power of .live and .one, together at last!

(function($,undefined){
  '$:nomunge'; // Used by YUI compressor.
  
  $.fn.liveOne = function( types, data, fn ) {
    var that = this;
    
    if ( $.isFunction( data ) ) {
      fn = data;
      data = undefined;
    }
    
    function wrapper() {
      that.die( types, wrapper );
      return fn.apply( this, arguments );
    };
    
    if ($.guid) {
      wrapper.guid = fn.guid = fn.guid || $.guid++;
    }
    
    return that.live( types, data, wrapper );
  };
  
})(jQuery);