A new white paper was released a few days ago by Microsoft, written by MVP Jon Flanders, on the ESB Toolkit.
It’s a well written paper that walks through the architecture, and shows examples, and serves as both an overview and a mini-tutorial. Great place to start if you want to come up to speed on this.
He REALLY nails it well in the summary, I would quote it here but that would violate the copyright, so I’ll paraphrase: “hey this is really cool and powerful, and adds tremendous business value”. That doesn’t do it justice though, I’d suggest you go read it for yourself.
You can get it here. Enjoy!