As quoted from TwilightPrincess on the Rithum.com Forums:
...Rithum is owned by FlashFlashRevolution, Inc. And the parent site, FlashFlashRevolution.com, was finally taken down a week or so ago. People attempting to connect to the site over the past few weeks have been left with a Christmas maintenance message, stating that the site would be back online "later today", which never happened...