As a conversion optimization consultant, this is very interesting. It's not a new idea, but the execution is really great. The setup process was easy to do and understand.

A few comments:

1. Does the script really need to be at the bottom of the <body> tag? All my projects use Google Tag Manager -- which is placed at the opening of the <body> tag -- and it'd be much simpler to plug it in with GTM without ever touching code.

2. What does the JSON output look like? I wonder if it's acceptable for Mailchimp/Mandrill or other mailing list services.

3. I think it's a bit early to claim you have "enterprise-grade" targeting. How about IP filtering? Custom event triggers? Etc.

4. Is A/B testing capability in the works?

5. Any way to modify the popup code? I'd love to be able to add custom GA event tracking, and such.

With all that said, "Enterprise Level Conversion Optimization Kit" is really overselling yourself. Enterprise level? No. Conversion optimization? Only if your top-priority conversion is getting emails, which is rarely the case. That definition needs some more work.

Edit: And as several others have mentioned, the actual popup on your site is wonky. I tried triggering it (by moving my cursor towards the top-right corner) but all I saw was a very quick flash of the screen, followed by the small sticky appearing in the bottom-left corner.