Blue Storm 0 Light Poster

Ok so does anyone know of a GPO or a way that will restrict my users from saving UN and PW in IE? I run around 600 public facing machines that I lock down. Recently I found out that they can save their UN and PW in IE6. I will be deploying IE7 shortly so if you know how to prevent this from happening in that version too I would greatly appreciate it.

Also, does anyone know of a good IT forum that is more geared toward the enterprise field.

Thanks in advance!