Five ways to make $100 or more every day
1.) Freelancing. Offer a service, such as writing (content creation), design, coding, SEO, etc. I know many people who don't even have sites that exclusively provide services and make well over $100/day.
Can it be scaled? Outsourcing is key to scaling.
2.) PPC. You all know what it is. Don't listen to ANYONE who says "that market is way too saturated." Keep this in your mind: there is no such thing as an oversaturated market. Yes, this includes things like ringtones, nike, dating, adult, etc.
PPC-Coach is fantastic for learning, but there are so many resources on how to properly optimize PPC campaigns you shouldn't have trouble learning, even without PPC-Coach.
A final note: Yes, PPC does require an initial investment, but it isn't nearly as much as some would like you to believe.