Download: http://grapehic.com/nprogress-slim-progress-bar/javascript/jquery Demo: http://grapehic.com/demo/2013/08/nprogress/index.html
Seems a bit hefty for something that CSS should have made simple to implement; particularly since it's reliant on that bloated jquery nonsense. Might be a good candidate for a rewrite without the library and to leverage CSS3 to do more of the grunt-work. Of course the demo's use of buttons outside a form for non-form activities and presence of scripting only elements static on the page... well... It's a nice idea though, just not wild about the implementation.