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Considering that your Hire me banner covers one of the Sign up links then yes, this will have an adverse affect on signups.

I would suggest putting it as a small text link in your footer instead, maybe "Want to hire me? Email..." under the copyright note.

Perhaps, http://mailchimp.com/why-mailchimp/ will give you some more pointers.

When I visit your website I would like the following answered:

- Why do I need to read new reviews of my iOS applications?

- And more importantly, why would I pay for this service?

- What's your value proposition?

TLDR: What is it?

It doesn't give enough info about what you're offering. As a potential (paying) user I need to see some features and benefits on the homepage.

Apparently all 3 of Twitter names I own and use are still available :/ I'm thinking that now you're up you should bug check it.