Great question. I too would like to know a good way to handle this.
Is there an existing flash component (or java applet) that could be used on a web page to do the uploading (ftp re http) ...and show a nice percent complete status?
You wouldn't want the upload to quit at half of the 200 MB because the user accidentally did a browser "back", so any tool would have to have some javascript to help stop from moving from that page.
-Jim