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Looks very cool, but it doesn't seem to be able to rearrange divs and other elements, which is what I really need.

For any large page or template based system, there is almost always going to be a backend involved, which means that dynamic editing tools like these don't serve much of a purpose.

However, for one off pages like landing pages or quick and dirty signup pages, something where you could layout all the elements and text with a simple wysiwyg would be a blessing.

There's a recent Railscast about this: http://railscasts.com/episodes/296-mercury-editor

Looks very slick!

the "test it out" button doesn't do anything other than show a toolbar at the top. Chrome Unstable 16 on Linux.

The toolbar works for multiple areas on the page. After clicking on "Test It Out" you can focus on and edit the "Mercury is a full featured HTML5 ...." and "Core Features ...." page sections.

Mercury editor - full featured html5 wysiwyg editor