Class.create() is used to create a new class, and invoke the initialize() method of the created class.

Compare this regular class creation:

MyClass = function() {}
MyClass.prototype.initialize = function(a, b) {
    this.a = a;
    this.b = b;
}

var mc = new MyClass();
mc.initialize("foo", "bar");

with this one using Class.create:

MyClass = Class.create();
MyClass.prototype = {
    initialize: function(a, b) {
        this.a = a;
        this.b = b;
this.secondfunc();
    },
    secondfunc: function(){
this.t = 'secondlife';
}
}

var mc = new MyClass("foo", "bar");
alert(mc.t)

Inheriting
(to be continued)