Technology magnate and business icon Steve Jobs has kept his health a private matter since he was diagnosed with pancreatic cancer mid-2004. His resignation yesterday as CEO of Apple Inc. (NSDQ:AAPL) has many wondering if he may have taken a turn for the worse. Since becoming CEO in 1997, Jobs took Apple from a $2 billion afterthought to a contender for the world’s most valuable company with $344 billion in market share.