Flatiron Theme - A beautifully designed responsive one page template by Squarespace with AJAX loading content for portfolio items.
Unique One Page Website Review
Western Legacy Partners
Good launching soon page that works as far as iPad with regards to responsiveness.
Our client needed a simple landing page while their full website was being built. It utilizes a fullscreen responsive background image, newsletter subscribe form and a colophon area in the bottom right that expands when the user hovers over it (using CSS3 animation).