This "news" article from betanews.com claims that Steve Jobs symptoms (which famously kept him from giving the keynote address at MacWorld this year and have him out on medical leave from Apple) are consistent with Crohn's disease.
Personally, I think it is presumptuous and rude to armchair diagnose someone from rumored symptoms and vague information. Also, the only information that jobs did release to the press was that he had a hormone imbalance which effects his body's ability to absorb nutrients. Crohn's disease certainly causes malabsorbtion of nutrients, but as far as I know there is not particular hormonal link with Crohn's.
At any rate, I wish Mr. Jobs a speedy recovery and all my well wishes. Since he had pancreatic cancer, I personally suspect this may be related to his past sugury. Hopefully it is something that can be treated easily.
A little (terrible) part of me might wish that Steve Jobs really did have Crohn's. I would not wish Crohn's on ANYONE - it is a terrible disease. But... think for a moment about what kind of resources Steve Jobs could put towards cures and treatments for Crohn's...