Looks like you have a bad_httpd_conf error, which means (yay) nothing’s lost! It’s just really, really annoying.
We have some debugging tricks here: http://wiki.dreamhost.com/Bad_httpd_conf
If you check your domain at http://www.whatsmydns.net though you’ll see your domain has two IPs, which isn’t right. I would try saving the server config, and then refreshing DNS, to force things to catch up again.