A demo of the new file upload progress monitoring functionality which is included in PHP5.4.
A more detailed description can be found in my blog post about this example http://chemicaloliver.net/programming/php-5-4-file-upload-progress-and-html5-progress-bars/
This demo requires PHP 5.4 and has been tested using Ubuntu 11.04 using prebuilt PHP 5.4 packages available here: http://apt.damz.org/