With many web applications it is a common requirement that users are allowed to upload files. If the files are large however, this will take some time, and it's best to be able to make the user aware of the file progress. Well I've found a free and open source file upload progress meter, that can even be used with PHP 4!
Here's the link for the file upload progress bar class. The blog post explains the history, as well as how to use a new plug-in of the Form Generation and Validation class to show an upload progress bar and live upload statistics using AJAX COMET requests.