Gamers with accounts at Atari.com and TDU2.com (Test Drive Unlimited 2) got a rude awakening today when Atari reset all login data after the discovery of a date breach at then subsidiary Cryptic Studios back in December 2010. Atari was quick to point out in the e-mail that they've since sold Cryptic and any break-in of their networks occurred nearly a year and a half earlier than the notification.
If the existing user name and password was used to access other online accounts, we highly recommend that you update those passwords as well.
Database hacks are not an uncommon practice of the disgruntled internet masses, but such a lengthy delay in user notification is. While Atari might not be as high-profile a victim as Sony, certainly users of Atari's website or Cryptic's games should look into the matter immediately.
Further details including how to reset your password (or hopefully how to remove your data entirely) can be found at Atari's site.