At the bottom of their site they say it's is powered by these two tools:

WordPress Membership Sites & Landing Pages by Premise
Premium WordPress Themes by StudioPress

Thanks Will

Go and download any WordPress Landing page creator plugin and configure it properly, that's what copyblogger media has done with their plugin Premise.

Some themes will have this built in, as mentioned, but there is an easy way to do it with any theme.

Create the static page you want to be the home page and create another page called "blog" and leave it empty.

In your WP dashboard, go to Settings > Reading and at the top where it says Front page displays choose the Static Page radio button.

Below that select your static page for the Front page and the blog page you created for Posts page.

The main URL will show the static (squeeze) page and the menu item "blog" will take you to the blog pages at the URL domain.com/blog/.

Mahlon

There's quite a few WordPress plugins designed for split testing, I've written about them on my blog. The major issue with these which you appear do not mind is that they are designed for pages or themes not posts.

Do a Google search for A B split testing WordPress and you'll see quite a list. If you're into coding there's also a lesser known one called Shrimp test which is really very flexible but less user friendly unless you know your code.

Hope that helps.

You also might wanna look into changing the page template in the post/post settings.

You can also easily create your own custom page designs and integrate them into a WordPress theme as long as you include a get_header() php call at the top of the page and a get_footer() php call at the bottom.

an other option is to have a basic html page at the root level, and have your WP instance installed at domain.com/blog.

Hello

Many themes will have this function built into them - you just need to search.

Also, as mentioned above you can create your own full width page template. Then go to settings and choose to use this as your homepage, and then choose another page to show your blog posts.

Here's a link that could help:

WordPress › Support » Full-width page [Creating Your Own Page Templates]

Clare