MetaFilter appears to be down, but unfortunately, the problem is out of my hands as it is a network issue on my ISP's side. Here's their word on it:
We are currently experiencing a network interruption that is affecting a a wide section of The Planet's network.
Our network engineers are diligently working to resolve the issue and we will update you with additional information shortly
Thank you for your patience.
UPDATE: We're back online, looks like it was about 2-3 hours of downtime total.