Unless I’m missing something this is the most impressive AJAX loading One Pager I’ve seen. Kangaroom is basically a spare room and house share search engine. The design is slick, transitions are smooth and UX is excellent. And to put the cherry on top it adapts perfectly to mobile. Amazing what you can do in One Page.
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 15 June 2013.