This is a demonstration of an AJAX powered progressbar to monitor file uploads with (Cake)PHP. Yes you’ve heard right! Well, but before you begin to drool all over the place, there is one downside: it requires a Perl script that allows you to know the upload progress. But besides this little downer you have a maximum of flexibility regarding the design of your progress-bar and integration in your system.

Website: http://thinkingphp.org/demos/cake-timer/