I just published my first Rails 3 gem engine: delayed_job_admin. It’s a simple admin interface for Delayed::Job. José Valim’s enginex made it a breeze. I gather that Piotr Sarnacki pulled the functionality into the in-progress Rails 3.1, so making engines like this is going to be a no-brainer very soon. Give it a try - it’s easier to create a well-tested gem engine than you might think!