What Affiliate Marketing Ebook?

I was wondering of there is a decent ebook out there on Affiliate Marketing? If so, which one(s) would you consider a "must read"?

I would say that The Ultimate Niche System is pretty good. You can find it in the DL section. But more important than finding a good ebook is to stick to the plan outlined and not get distracted by the next shiny object that the gurus come out with. Good luck!

Thanks, I will check that out. Been watching some videos today. Just trying to find a system that feels good to me. I might have pieced something together so time will tell.