Autour de SWFUpload
http://www.swfupload.org/
http://ajaxian.com/archives/swfupload-a-nicer-file-upload-experience
http://ishouldbecoding.com/2008/03/08/swfupload
http://www.appeddesign.com/rails_swfupload
Alternatives :
http://mike.kruckenberg.com/archives/2008/02/inline-web-browser-file-upload.html