large file uploader with progress bar

We are currently using filechucker successfully to upload large video files, but they have a 2GB file size limitation for uploads with 32bit browsers. They use a big perl script with a customizeable preference file to change uploader behaviour. We need something that will give us large file (>2GB) upload file support with support for browsing local file system, and a very robust, possibly fault-tolerant (define that how you will) uploader with a progress bar. Once the upload is complete it would be nice if you gave us a trigger event so other scripts could run, but alternately we can use time-based polling, though we don't really want to, it's not very efficient. The progress bar seems difficult in php. We don't really care if you use java, javascript, AJAX, ruby or whatever, just that it will work with large files and isn't asp/.net based.