Are there any good resources to learn Service Broker? I'm looking for a newbie-friendly guide.
Some online articles:
I myself host a few articles:
And there are several introduction level practical examples:
A good place to start could be Getting Started (Service Broker)
Also, to add to the list, once you've gone through those articles, try running the downloadable chapter-by-chapter examples in this book:
(can download the sql scripts and example c# projects from the publisher's web site, but 90% of the explanation is in the actual book). The best way to get started is often to build some stuff.