ReadOnlyRichTextBox - Roland Weigelt
This is a lot better than the previous solution, I think I found this before... what ever, set style then you dont need to set Enabled = false. Then you can set backcolor etc to make it look what ever you want. :)

        public ReadOnlyRichTextBox()
      {
          base.ReadOnly=true;
          base.TabStop=false;
          this.SetStyle(ControlStyles.Selectable, false);
      }

I knew that I had the perfect solution before.

  const int WM_SETFOCUS = 0x0007;
  protected override void WndProc(ref Message m)
  {
   switch (m.Msg)
   {
    case WM_SETFOCUS:
     // We don't want the RichTextBox to be able to receive focus, so just
     // pass the focus back to the control it came from.
     IntPtr prevCtl = m.WParam;
     Control c = Control.FromHandle(prevCtl);
     c.Select();
     return;
   }
   base.WndProc (ref m);
  }