That's Klaus's book, right? That's the best book by far, however two words of warning:

1) If you haven't actually setup your first working demo or app yet (even a toy one), then don't follow Klaus's book just yet. You need to get through at least one (and only in SQL) first before you go any further because it turns out that there's a dozen little things that can derail you before you can get even a demo app to work. There is a ZIP file of a technical presentation with (working!) code examples at my blog site (www.MovingSQL,.com) called "The Top 10 Reasons You Aren't Already Using Service Broker". Download it and take a look, it's basically a troubleshooting guide for the initial steps of putting a working app or example together.

2) Klaus's book is very gung-ho on SQLCLR, but you definitely want to get a working example in SQL before going to CLR, because CLR has a raft of it's own limitations. If you're already familiar with them, thats fine, but IMHO, you don't want to be working out the problems of (1) and (2) at the same time.

more in a minute...