Mel noticed yesterday that the various modules (twitter and pictures) on the front page were broken. I looked more into it earlier and saw PHP complaining about DNS. Sure enough, I couldn't dig from the box. Mel then remembered that QTS had migrated to new DNS servers. Repointing to those didn't work because of host firewalls or something. Riggan pointed us to some recursive servers and now everything is working.
Nothing to see here, move along.
Just letting everyone know in case they were wondering.