An Ajax Plugin Helper for the WordPress admin plugin page. Adds Ajax activate, deactivate, delete and upgrade functionality.
Uses wp_cron to delete comments each day that are marked "spam" in the database.
Easily remove any/all of the default WordPress dashboard widgets
AJAX-based table manager for WordPress. It is built using the excellent data grid from DrasticTools.
Update (17. November 2008): I keep this plugin here for reference but since WordPress 2.7 there's a [Plugin Installer](http://codex.wordpress.org/Vers