Steve Jobs today in his keynote (or is it Jobsnote) at WWDC in San Francisco talked up the iPhone as a truly mobile Web 2.0 solution. Jobs said that the power of the ’full’ Safari browser on the iPhone lets developers design and use real, Web 2.0 applications like widgets. That’s right, third-party developers will be able to make applications for the iPhone. But just easy will it be? Is this …