Ajax Upload; A multi select file upload script with progress-bar, drag-and-drop.

This plugin uses XHR for uploading multiple files with progress-bar in FF3.6+, Safari4+, Chrome and falls back to hidden iframe based upload in other browsers, providing good user experience everywhere.

Features:

Multiple file select, progress-bar in FF, Chrome, Safari
Drag-and-drop file select in FF, Chrome
Uploads are cancellable
No external dependencies
Doesn't use Flash
Fully working with https
Keyboard support in FF, Chrome, Safari
Tested in IE7,8; Firefox 3,3.6,4; Safari4,5; Chrome; Opera10.60;

Demo and Source:

http://valums.com/ajax-upload/