When appropriate, Trevor Davis really like the ones that add smooth scrolling and highlight the navigation depending upon which part of the page you have scrolled to. That’s why he wrote jQuery One Page Navigation Plugin.

He wanted the page to scroll smoothly when the navigation was clicked, so he used the jQuery ScrollTo plugin. He also wanted the page to automatically highlight the correct navigation section depending upon which section was scrolled to, and that was where he added some custom code.

Requirements: jQuery Framework
Demo: http://trevordavis.net/play/jquery-one-page-nav/
License: MIT, GPL License