To forestall any potential rumors, the GHF thread referenced is related to Fligg's last Twitter update, stating he had to go in for an appendix removal.
http://twitter.com/Fliggerty
Do not take this next part as absolute fact, it is based on 2nd and 3rd hand information. From what Wolf told me, Bryss posted mentioning that Fligg had to make another visit to the hospital. I'm assuming he went to a doctor, was told he had appendicitis, and had to go to the hospital later for the operation (a quick and safe one). At least, that's what happened when I had it a few years back. Having an appendix out isn't really a big deal, it's a quick snip and snatch and a couple days on the sofa.
As far as I know, this is completely unrelated to the site. Fliggerty hasn't shut down GHF before when he was going to be away for a brief period, but GHF has been down for brief periods while he was working on it, or the ISP was doing work. That's a far more likely scenario. Personally, I'd bet he's back and recovering in front of GHF's admin control panel.
Edit: Or online and reading this thread. >.>
If GHF isn't back up in a couple days, I'll try to get in touch with Fligg, Jac, and the rest of the magisters and find out more. But at this point, there's no reason to worry.