Multiple File Uploads and Progress Bars

Has any here succeeded in building a multifile simultanoeus file uploader and if so taken it further to add progress bars to each file uploading?

I posted about my research on the topic so far here:
http://www.rubyonrailsblog.com/articles/2006/10/08/multiple-file-uploads-with-rails-and-progress-bars

and would be interested in seeing what others have put together. Thank you

Ben