Better explanation will come soon....

Messaging system to ease user experience.
Example usage: sending mails, archives, stats, resizing images, updating search engines, creating feeds

Anything that user don't expect instant feedback and is better up processed as background cron process.
Supports event names and tagging mechanisms to figure out what workers is 'listening'  for what events.
One 'manager' worker is responsible for delegating messages to workers.

This is basic workflow
http://github.com/utvara/phpworkers/raw/master/docs/worker_proces.png