Took me a while to work out what was going on. I couldn't get the site from my tablet, then http://www.downforeveryoneorjustme.com/gpwiki.org
said the site was down. (panic set in at this point.)
When I couldn't get to the site on my compy box, I checked my other sites based off the same server and found they were also offline. So I went to my web host and their site was down too.
Eventually I found my web host's twitter feed and got a status update from there. I do believe I've found a good use for twitter and an thinking about setting up a GPWiki feed for occasions such as this.