I would change up the front page a bit. Currently, the 4th element (the subheading in the caption to the picture under the headline) is what tells me I can edit-in-place. The animation is great, but I opened the page in another tab and then clicked over to it a moment later, by which time the animation had completeed. I didn't see what the big deal was until I read that. Instead, I'd make that the headline: This is your editor. Because the immediate editability is the big win. I loved the UX and how responsive it was.
Minor caveats: some of the fonts don't render right in Chrome, but have the bottom of the letters (descenders etc.) chopped off. I'd really like some toolbar widget to turn on a grid for those times when I want to line things up or maintain a vertical symmetry.
Last issue, the Learn More page. Visually and semantically, it's great - it makes a compelling argument and does so in a humorous fashion. But you don't tell me anything about what I'm publishing - is this flash? HTML+CSS? Something else? That information should be there so I understand whether I'm buying into your hosting walled garden, or renting a general-purpose tool that I can then deploy and further develop as I see fit.
I also think you should put the $ cost up on the Learn More page and offer a link or argument for the price. I hate hate hate not seeing the price information until I get to the sign up screen, it always feels like a gyp. Wear your price on your sleeve; that establishes that your product has value from the outset, and doesn't confront me with an expensive surprise when I try to sign up. Invite me to put my hand in my wallet before signing up, otherwise I feel like there's a little bait-and-switch going on.
Don't take these criticisms as bitter medicine - I think this is a fabulous offering, and that's why I've critiqued it in such detail.