zhoutong, just to let you know I am currently working on a Bitcoin book that I will also be publishing as an ebook soon.
This shouldn't stop you from writing your own book as our books will definitely be different. There are a half-dozen books on Starbucks, for example. Each of them is unique.
From your outline, it looks like you are focusing on the technical and philosophical aspects of Bitcoin. I focus more on the business aspects. The more information out there on Bitcoin the better.
Good luck.
Thank you for letting me know. I knew that someone else could be doing the similar things.
I'm not exactly focusing on technical and philosophical aspects, basically the purpose of the book is to introduce Bitcoin to newbies, and present the revolutionary currency to them in an interesting way. If you want to target existing Bitcoin users, business will be a great way to go - Bitcoin needs more entrepreneurs. Either way is perfectly fine.