FileChucker is helping drive the backend of several high profile entertainment sites for people like Shania Twain and Dolly Parton. We're also using it to drive backend file uploads for a multi-billion dollar banking institution. It's a great product. We've tried other "chucking" upload solutions with progress bars using flash and php, but nothing works as reliably as FileChucker.
FileChucker is a great drop-in solution for file uploads, and worth every penny of its very reasonable cost. Encodable's support is excellent to boot.
I looked all over trying to find a simple cgi script. I found that FileChucker was by far the best. If you have issues with your hosting service's php.ini max upload size then this is the way to go. Looking forward to future enhancements.