I don't want to sell this here! It is not even finished yet, you can only see the landing page and it is not possible to sign up. I only posted the URL as it contains more information about the idea. I would really just highly appreciate some feedback from developers if this makes sense at all.
I wonder if I am the only person having this problem and if I would create a solution for something that nobody needs or if developers often encounter this problem. Of course I asked all the developers I know in real life, but my social circle is limited so I wanted to ask the question here. And the response from friends is usually biased toward pleasing you, I want to find out the truth, so I would love to get some responses from strangers

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Currently I am using JSON as I also want the service to be usable from other platforms such as Android or Blackberry devices, so that you can reuse your content across different platforms. But having binary plists is a good idea for iPhone applications, maybe I can offer this in addition to JSON.
Thanks for your feedback, highly appreciated!