Thanks to all who have contributed. Please let me know if I missed anyone.

Saimon Moore for writing the generators and rake tasks to make this work as a plugin. 

Werner Bohl for making the css/js progress example. It's much appreciated.

Michael Klien for the timestamp expiry options. :accessed or :created

David Lemstra for the threading and job control enhancements.

Georg Friedrich for configurable ACL lists.

Gunter Ladwig for singleton workers.

Ben Johnson for bug reports and fixes

Michael Siebert for patch to support cron style workers. And for autostart workers.

Chris Hulbert for win32 daemon and service implementation