It’s really hard to find any kind of information from experienced performance marketers. You generally have to wade through all the gurus who have no real idea or sign up to a paid forum full of newbies.
Finch is an English guy I believe who now lives in Thailand, has been doing affiliate marketing for ever and now runs a smallish team. The guy obviously knows his stuff and there is some really great usable knowledge inside this book. From landing page tips to industry news and vertical analysis. There’s good advice for some of the common traffic sources and he talks a bit about the pros & cons of cloaking for a living.
If you are an affiliate marketer you should read this: http://finchsells.com/