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I don't see why that would be worth $3 a month. In the vein of http://monkeymace.com/post/23937902775/all-you-need-is-e-mai..., why wouldn't you just have one email thread where everyone replies what they did? This seems over-engineered.

At a basic level, over 99% of the internet is text files and simple databases. Why would you have web pages?

The interface is often important.

Because the information ends up being distributed through email anyway, just via a third party.