This page demonstrates the use of an AJAX file upload plugin I've been working on. The source for this plugin can be found at: https://github.com/trent-/apex-ajax-upload

1. Install the APEX_AJAX_UPLOAD package.
2. Import the plugin
3. Create a new page item, specifying plugin, and the plugin as: AJAX File Upload
4. When prompted, specify the following settings, at a minimum:
   
   Table Name
   File name column
   Mime type column
   BLOB column
   
   
5. Then test it works :-)