When I put together my 2004 plan, and listed my book ideas, a book on my experiences as a program manager was high on the list. Two reasons:

1) I was afraid I’d forget all that I’d learned in a year or two, or wouldn’t be able to write about it with an accurate perspective anymore if I waited too long
2) From everything I’ve learned about publishing, writing about something you have 10 years of experience with helps a ton in landing a proposal.

So I’ve been kicking around an outline, and today spent part of the day rolling together something like a book. I had a list of 35 chapter ideas, and got it down to 18. Almost book sized. I reused an aborted essay as the start for chapter one.