Squarespace is by far the easiest way to create a slick One Page website. Their templates and support are both excellent. Learn more.
One Page WordPress Theme Review
BreeCode are back with a WordPress version for their very popular 'Xiara' responsive one page HTML template. It's packed with tons of features and all fully customizable so its a steal at $35.
Xiara is an Responsive Onepage Parallax Theme. Xiara is a smooth, simple to use, agreeable and clean theme. Everything in Xiara was made to give the best user-experience possible. We carefully focus in the design, colors, layout, usability, and typography.