The Minnesota State Parks Reservation system is still down.  But you can submit your email address on this page (http://www.dnr.state.mn.us/reserve-faq/index.html) if you would like to get updates.  I assume they will email you when the site is back up.  I’m on the mailing list and plan on emailing everyone I have emails for when I here the system is back up.  However being on the mailing list directly is probably a good idea.