Kudos to ax for finding that www.bungie.net has been updated. Myth II's bungie.net is back, but Mordia had this to say:

The servers will go down again some time this summer, intentionally this time. When this happens it will be because we are moving the boxes to a data hosting facility where no one outside of Bungie can get their grubby little fingers on them (or their necessary ports). The TFL server will remain down until this time so that Tom Big Guns Gioconda can take a much deserved rest.

This is disappointing for those TFL die-hards, but at least you can still find games using BattleWatch.