I just submitted (nine minutes ago) our book proposal to Addison Wesley, the publisher who did my first book on Use Cases. This is our first submission. Most publishers ask that authors do NOT do multiple submissions, meaning that we need to hear back from these guys before we shop around to another publisher.
Whew!! That was a long time coming (like four years or so).
I've posted the Word document here so all you budding authors can take a look at a finished (and we hope 'winning') book proposal.
Now we wait. Meanwhile, we are still cleaning up the first five chapters, because Addison Wesley will want those as "writing samples" for our reviewers quite quickly after they accept (???) our proposal.