Your description leaves lots of questions. You say it's an 'application and service', does that mean it requires a download?
Is it open to the public? or do you set-up groups, etc.
These are some of the questions I'd like to have answered before signing-up. At the moment, I'm not sure how I'd use the service.
I believe you've don a big 'no-no' with respect to including users e-mail addresses in the url. I gave you an e-mail address that I don't use, so don't care, but I'm pretty sure you don't want to do that, you should encode it with a secret key, or use user-id's.
Now that i've signed in, I have absolutely no idea what to do. How do I create a new entry? How do I invite people?
Can I only have one 'main' page and I have to edit that?
I can't say I have a real need for a product like this, but my gut instinct tells me that if I did have a need, I would want to create and share multiple documents with different people.
What are you doing that I can't do with shared documents on services like Google Docs?
To answer some of your other questions, the main page is your "start" page that you can edit and and then add links to new pages in the same way that you do on a wiki; the link will link to a blank page until you edit it.
The concept is that you can store the pages and make them public if you want to share.
I agree there is still more polish that I can and will add, and I'll fix the email address issue!
I think a video tour or screen cast, if done right, would answer a lot of these questions.
As far as your actual service is concerned, I don't know why I would want this. It would be helpful to know what you're providing that I can't already get from other more established services.