Plupload - Multiple Files Upload Script
Plupload is currently separated into a Core API and a jQuery upload queue widget this enables you to either use it out of the box or write your own custom implementation. Drag & Drop support of files is currently only available in Firefox 3.5+. Image resizing is only possible on Firefox 3.5+ and only at a fixed quality.
Developed by Moxiecode Systems – the developers of TinyMCE WYSIWYG Editor; Plupload is available for download under GPL2 License. You can find further information, demos & download on Plupload Website.