A few hours ago Steve Jobs emailed to all employees Apple stating that he would retire for a time to focus on his health, leaving Tim Cook in charge while he returns. This is not the first time delegates responsibility Jobs Apple Cook, recalling that in 2004 had to withdraw due to pancreatic cancer, after that in January 2009 fell away again after only 6 months back.
Hopefully nothing serious is occurring with the health of the genius behind the block and we have him back soon.