Beyond that, none of them are good. It probably seems harsh to say that, but none of these really do any important thinking about how interfaces are supposed to work. Design isn't just making stuff pretty, it's making stuff work well. Most if not all of these apps are basically a fresh coat of paint on an existing product or the envisioning of a new product as it is similar to the current form.

To summarize:

- None of them look like Mac apps

- All of their interfaces are superficial

- Most of their interfaces are difficult to replicate in the native Mac development environment without extensive custom work

- None of them actually exist beyond being pictures!

How do you know that any of these ideas are actually good without trying them? A picture's worth a thousand words, but if it looks better than it works it's worth a huge loss in customers.

Sorry if this sounds grumpy, I just don't really understand the point of this at all. Everyone who's interested in pie-in-the-sky conceptual app designs that are more focused on eye candy than usability has dribbble already.