Book proposals: a question

Rob says....

"One more question, if I can. I am also looking at a non-fiction work. How much information will I need in my proposal before sending it off? Is there a good on-line resource for putting together the proposal/query?"

My book proposal for Pen on Fire ran around 50 pages. Parts include the overview of the project, a bio, marketing plan, comparison survey, chapter outline and three chapters or 30 pages or so of text from the book.

I don't know if there are online resources but I'll tell you what book served me well: Michael Larsen's How to Write a Book Proposal. I followed it pretty much to a T and my agent garnered a great deal for me. There may be other good books on writing book proposals but this one worked for me. (Larsen is an agent in San Francisco.)