Features:
Simple install
Simple usage
Very Good administration control
Easy TinyMCE plug-in [Just place the tinymce directory in the ajax FB root and... tinymce will be automatically be recognized. i think that is cool ]
Is hosted on sourceforge and you will see that is a beta version but believe me it works fine i've tested it and i didn't find any bugs what so ever !
If you want a very,very simple ajax file upload try here. It's somewhat of kit of the actual script. Give it a GO anyhow.