Generics + IoC Container = Good bed fellows?

After playing a little with Inversion of Control Containers... and being annoyed by the backing of a Hash Table or Dictionary, I decided to use some generic magic. And just for giggles I tossed in some .Net 3.5 Extension method love. Oh, as a warning... I build this on VS2010 Beta 1 so the Range object's constructor has optional parameters. Please feel free to leave questions and comments. -Thanks, Matt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Collections;

namespace GenericIoCandDI
{
    // quick and pointless example
    class Program
    {
        static void Main(string[] args)
        {
            new List().Register>();
            new List().Register();
            new List().Register>();

            GIoC>.Get.AddRange(0.ToRange(10));
            GIoC>.Get.AddRange(20.ToRange(30));
            GIoC>.Get.AddRange(10.ToRange(0, -1).Select(v => (uint)v));

            //0,1,2,3,4,5,6,7,8,9,10
            Console.WriteLine(string.Join(",", GIoC>.Get.Select(i => i.ToString()).ToArray()));

            //20,21,22,23,24,25,26,27,28,29,30
            Console.WriteLine(string.Join(",", GIoC>.Get.Select(i => i.ToString()).ToArray()));

            //10,9,8,7,6,5,4,3,2,1,0
            Console.WriteLine(string.Join(",", GIoC>.Get.Select(i => i.ToString()).ToArray()));

            Console.ReadLine();
        }
    }

    //IoC Container
    public static class GIoC
    {
        private static T _instance;

        public static void Register(T instance)
        {
            if (instance == null)
                throw new ArgumentNullException("instance");
            if (_instance != null)
                throw new InvalidOperationException("instance already registered");
            _instance = instance;
        }

        public static T Get
        {
            get
            {
                if (_instance == null)
                    throw new InvalidOperationException("instance not registered");
                return _instance;
            }
        }
    }

    //Extension Method Register magic
    public static class Extensions
    {
        public static void Register(this T instance)
        {
            GIoC.Register(instance);
        }

        public static void AddRange(this IList list, IEnumerable range)
        {
            foreach (var item in range)
                list.Add(item);
        }

        public static Range ToRange(this int start, int end = 0, int step = 1)
        {
            return new Range(start, end, step);
        }

    }

    //I find this to be some handy plumbing
    public class Range : IEnumerable
    {
        public Range(int start = 0, int end = 0, int step = 1)
        {
            this.Start = start;
            this.End = end;
            this.Step = step;
        }

        public int Start { get; private set; }
        public int End { get; private set; }
        public int Step { get; private set; }

        #region IEnumerable Members

        public IEnumerator GetEnumerator()
        {
            if (Step > 0)
                for (int i = this.Start; i <= this.End; i += this.Step)
                    yield return i;
            else if (Step < 0)
                for (int i = this.Start; i >= this.End; i += this.Step)
                    yield return i;
        }

        #endregion

        #region IEnumerable Members

        IEnumerator IEnumerable.GetEnumerator()
        {
            throw new NotImplementedException();
        }

        #endregion
    }

}