Tuesday Talkback: How do you get published?

Usually I answer your questions about writing, but today, I'm hoping that some of my readers are savvier than I am when it comes to knowing how to get published. I'm pretty well-versed in the screenwriting resources on the internet, but when it comes to book publishing, I know rather little.

So is anyone able to point me in the right direction to find out the best ways to approach non-fiction publishers? This includes what said publishers are looking for - a completed manuscript? A proposal and chapter-by-chapter breakdown of the book? Market research showing there is a market for a book in the proposed field.

And please, don't limit your suggestions to the web. If you know of some good books to pick up, please tell me. Or if some of you happen to work in publishing, feel free to drop me a line directly at zuulthereader@gmail.com.

Thanks in advance everyone.