So in nutshell:
No ability to install apps outside of the marketplace
No removable storage
No drag-and-drop support
No copy-and-paste
No Multitasking
Nicer UI
More controlled User Experience
Push notifications without a consolidate notification system
More controlled User Experience
More controlled User Experience
Ugh. I like Windows 7, but I just don't see how Microsoft thinks they are going to compete with the iPhone by following the same model. I already have an iPhone, but I don't like many of the above directions Apple has taken the platform.
If Microsoft is just going to offer more of the same, what incentive would I have to switch?
Although, I do like the 5 app limit per developer in the marketplace. I think that would prevent spam and encourage the production of quality applications. It would even be reasonable to allow additional submissions for a developer based on the success of their current apps on the marketplace.