Right as some of you have gathered via Facebook and Twitter, the THN is offline due to a hardware failure.
This is due to a disk in the RAID1 mirror failing this morning. The server will not be brought back online until the disk is replaced. At this time I don't have an ETA for when the disk will be replaced, since a new disk needs to be purchased and installed.
The one bit of good news I can offer, is the data on the THN is all backed up, so nothing (In theory) should be lost, and I have since taken another backup this afternoon to be safe.