I found a sad newsletter from the javablackbelt in my inbox:
Definitive Shutdown
2013-01-19 11:49
JavaBlackBelt
BlackBeltFactory
KnowledgeBlackBelt
Definitive shut down
Brussels, December 2012
Dear community members,
Last fall, KnowledgeBlackBelt.com was acquired by Skillsoft, a cloud-based learning provider. I regret to announce KnowledgeBlackBelt.com will be shut down on January 31 2013. As a thank you for 7 years of sharing and high quality content contributions, all courses and exams are complimentary with no limitations. Please take advantage of these educational resources until January 31.Sincerely,
John Rizzo
Imho it's a shame to take a site down that was hosting a lot of community material in favor of a commercial takeover.