Dig this minimal centered design in this responsive One Page portfolio for Flatmate web agency. Love the little pie chart in the corner that gives you an indication of how far down the page you are, nice touch!
This website has unfortunately been redesigned or gone offline, so I have removed the direct link to it. The screenshot below hopefully preserved enough of the design but if you are really keen to inspect further, try this Archive.org link. FYI: the site was first featured on 06 May 2013.