Looks pretty cool. One question - pricing? There's a "try for free" button, but there's no indication of how long the trial actually lasts nor of what happens after the trial. Note that I didn't sign up, - this information is only from the home and signup pages - but it would be great if I (or any potential customer) could see this info right up front.
Pricing will be for new, more sophisticated features, what you see today will always be free. Features like push notifications, a/b testing, custom campaigns, additional email themes, and so on.
I have learnt a lot from patio11 so we'll always be generous and honest about this stuff. Pricing simply didn't feel like a reason to delay launch!