I put together a Ruby on Rails demo using SWFUpload. It's based on the SWFUpload application demo and works roughly the same. It uses the latest version of rails (2.0.2) and swfupload (2.0.1).

http://appeddesign.com/rails_swfupload

Licensed under MIT so if you wish to keep it, use it, post it, whatever, please do so.

This is just a big thank you for writing such a wonderful utility!

Dave