Is Steve Jobs really sick?

Okay, so compare these two photos. The first one is from Macworld, in January 2007. The second is from yesterday, at WWDC. It would appear that Steve Jobs is wasting away. Tell me it doesn’t strike fear into you. I mean, aside from the personal issues that Steve and his family must be experiencing with his health…

Steve Jobs at Macworld 2007Steve Jobs at WWDC 2008

I have always known that I would live to see Apple without Steve Jobs at the helm (actually, I did live through the Gil Amelio days, just barely), but the thought of it actually happening frightens the bejeezus out of me.

Anyone else find these pictures striking and worrisome? Anyone know any details?