Single page web sites have been around for awhile. Lately the use of parallax appears to be growing in popularity.

 

Examples & Tutorials

http://www.webdesignshock.com/one-page-website/

http://www.designerledger.com/parallax-scrolling-tutorials/

http://themeforest.s3.amazonaws.com/116_parallax/tutorial-source-files/tut-index.html