Does anyone know if this has been removed permanently and does anyone know of any custom extension methods out there to achieve this?

It seems strange that they decided to remove this in Preview 2. 

Thanks in advance.

These are available, in the namespace System.Web.Mvc (class System.Web.Mvc.HtmlHelper)

Forget MvcContrib as it is removed from CTP 2.

The CheckboxList Helper is not there.

There is still a CheckBox helper there but no CheckBoxList anymore.

I can get around this by writing my own loop and writing the HTML but it would have been nice to use this and I don't know why it's been removed from from CTP 2 as it was there in CTP 1.

Here's an extension method which will probably work as expected:

    public static class  CheckBoxListExtensions
    {
        public static string[] CheckBoxList(this HtmlHelper htmlHelper, string htmlName, object dataSource, string textField, string valueField, object selectedValue, RouteValueDictionary htmlAttributes)
        {
            List<string> list = new List<string>();
            Dictionary<object, object> dictionary = MvcControlDataBinder.SourceToDictionary(dataSource, valueField, textField);
            foreach (object obj2 in dictionary.Keys)
            {
                string str = obj2.ToString();
                string text = (dictionary[obj2] == null) ? string.Empty : dictionary[obj2].ToString();
                bool isChecked = selectedValue.Equals(str);
                string item = CheckBoxBuilder.CheckBox(htmlName, text, str, isChecked, htmlAttributes);
                list.Add(item);
            }
            return list.ToArray();
        }
    }

Yes this has helped.

Thankyou.