jquery-transmit is a jQuery plugin used to produce a flash–based multi–file uploader for your pages, all this quite simply achievable:
$(document).ready(function() {
$("#transmit").transmit("http://mysite.com/upload/");
});
Now there’s no need to dive into flash or swfupload configuration files, multi–uploaders can be as simple a few lines of code.
Plupload is an open–source tool that allows you to provide uploading functionality for your website. So what makes it special? It utilizes HTML5, Gears, Silverlight, Flash, BrowserPlus or normal forms, providing some unique features such as upload progress, image resizing and chunked uploads—all this transparently and without the developer’s intervention.
This project is from the guys who made TinyMCE, so I’m sure incremental updates will be regular.