The degree program in my sig. They sell well overseas to people needing a job promotion and I advertise through Adwords and cheap ads on foreign websites. I get $39-54 for each sale made. I don't sell huge amounts but I make more overall than selling others things at 25 bucks a pop. I make enough off affiliate income to stay home and have for a few years now.
I like MoreNiche - they provide you a beginners guide, marketing e-books, site templates, articles and great support forum to help you sell their products. I started 2 months ago, had no affiliate marketing experience and now I am making regular sales