Although we usually see the iPhone as a great entertainment gadget less efficient for work, a recent research by the New York Times talks about the fact that during 2009 the number of companies using iPhone has doubled itself. In addition, around 70% of the companies listed in the fortune 100 are examining switching to the iPhone, mostly thanks to the improved support for Exchange.
Personally I find it hard to work with the iPhone mainly due to the lack of built-in multi-tasking (although this hack is really a great workaround).
As a result, I now work with the BlackBerry Bold on one hand (emails, documents and tasks, phone) and play with the iPhone on the other hand (photos, music, games, phone).
[BTW, the image above shows the new MobileSpoon site for mobile devices – check it out in The Mobile Spoon – Mobile Friendly Edition