What you can do is return a hand made collection, like this:

[ComVisible(true)] // may be optional depending on your other assembly settings
public class ResultList
{
    private List<Result> _innerList;

    internal ResultList(...parameters...)
    {
        _innerList = ...
    }

    public int Count
    {
        get
        {
            return _innerList.Count;
        }
    }

    public Result this[int index] // will be named "Item" in COM's world
    {
        get
        {
            return _innerList[index];
        }
    }
}

That you can use like this:

var results = oMyObject.GetResults();
for (var i = 0; i < results.Count; i++) {
    Response.Write("<br /><i>('" + results.Item(i).Value + "', '" + results.Item(i).ID + "')</i>");
}