Filez is a WordPress plugin that adds a popup file uploader/browser to the editor. It’s mostly useful for uploading and making links to archives like the ones at the bottom of this page.
Installation: Extract the archive in your WordPress plugins folder. Activate the plugin. Create a folder named ‘files’ under ‘wp-content’ and make it writable. Configure the options at Settings:Filez.
Upload and browse files using the button on the toolbar. Manage your uploaded files at Tools:Filez.
Migration: Since the WordPress media upload tool works quite well, I don’t use Filez anymore. The latest (last?) version of Filez includes a separate migration plugin tool that moves Filez files into the Media Library then replaces Filez tags in posts with links to the Media Library.
Download filez.0.9.zip (tested and working with WP 2.9.2).