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.
The work, the thought and the organization you put into this app is incredible.
FileChucker is working great... Clients love it. Vendors love it. We love it.