File upload progress bar

Has anyone implemented a file upload progress bar using Quixote?   For large
file transfers it would be nice to display the status, but I'm having a hard
time wrapping my head around the best way to approach it.

I'm assuming that I could use DHTML/javascript to make a call to a separate
page that would display the status, but I'm not sure how to generate that
page.  Do the Upload classes have any methods for accessing current
progress, or would I need to write that out somehow to a separate file,
which could then be checked by the progress request?

Any advice or hints as far as getting the status out of Quixote would be
greatly appreciated.

One example I found that does what I'm looking for was in Rails, and is
available here:
http://sean.treadway.info/demo/upload/

Thanks!

-Charles
http://www.subcircuit.com  <-- Quixote in action :)