Yeah right now you have to have an account, then you have direct access to customer support via the UI.

A FAQ page I should put together, that's correct.

Your questions:

1. The tiers differ in pageview restrictions and developer support access. The highest tier provides migration support for the platforms that don't have automated migrations today (you can import from Disqus, Commento, and a couple others).

2. Right now domains are unlimited and validated at TLD. When you sign up just enter the sites you want to use like.com, this.org. For example, I dog-feed it on my blog at blog.winricklabs.com, but I only have winricklabs.com on my account.