Um, what I can't believe is that people would doubt that Steve Jobs uses an iPhone.
All phones have this development phase called testing, it is where people internal to the company use prototypes of the phones as there main phone and see how they work. Ask anyone at Motorola or any phone company and they will confirm this. Anyway, with Steve's love of control and having his hand on everything, the idea that he would NOT be a tester is absolutely ridiculous. Also, since they had a working phone at the keynote it means they are at the stage where they can start testing it in this way.
Now whether or not that is a picture of Steve with an iPhone or not is still up for debate, but does it really matter?