Very well written article, I hope to see more about service broker in the future. As to implementations of Service Broker, basically it's only as complicated as you want it to be. You've seen the basic implementation in this article, you can get really really fancy with retrying, automatic poison message handling, dynamic endpoint routing, and lots more. I've used service broker for an audit implementation and it's really easy to know what can go wrong where and what to do to fix it.