SwDragndrop is doing asynchronous calls to upload images. Few changes could adapt it to upload any kind of file. The 2 main interesting things about this plugin: - Asynchronous upload of images without flash: I used a trick consisting in sending the request to a hidden iFrame and listen to its onLoad event. Works... except for IE6 and IE7, sorry... - Drag'n'drop upload for people using Firefox 3.6+