I'm new to affiliate marketing - haven't even set up my first site yet. I want to get into it soon, though. I'm just trying to think of a profitable niche. Is Clickbank a good way to bring in some income if you can target the right niches? Is it still "working?" Should I use Amazon Affiliates, Clickbank, or both? Also, if someone could give me a very quick summary of how "gravity" works on Clickbank I would appreciate it...I think it's more complicated than "the higher the gravity, the better"?