I know you can't do that wit conventional methods but here's an intriguing thought if you're uploading large files through a browser like me:
I know that php receives the file and puts it into a folder, normally /tmp, and I think it's destroyed when the script finishes.
However, while posting a very large file from my browser, I went into the /tmp directory on my server (as root) and couldn't see the file.
If I could see hte file, I could run a separate iframe page which would look for a changing /tmp file, and I may be able to get information back to the user by javascript.
Anyone know why I'm not seeing the file on the server however?
Sam