Epilogue: looks like it was announced (indirectly) here: http://www.nwchem-sw.org/index.php/Special:AWCforum/st/id856/#post_3167
Update 10/6/2013: the site is back online.
www.nwchem-sw.org is currently (Fri 7 pm 7 June 2013 PDT; Sat 12 pm 8 June AEST) rejecting all connections with
"The specified URL cannot be found"
It's been doing it for a couple of hours now. It doesn't matter what your target URL is -- all connections are rejected.