I work in advertising and have many clients who do various 'work from home' businesses. I would tell you to be wary- some are legit, but many are scams. To be successful at any of them, you really have to be prepared to treat it as a job.
I would absolutely say do NOT start a home daycare as a way to make money unless you have experience as a childcare provider or teacher and are really devoted to other people's kids. It CAN be a good way to make money while staying home with your own kids, but it requires a lot of effort and can be very frustrating and is no way an assured income. Don't do it unless that is something that REALLY interests you!
If you have office experience, look into doing medical billing. You will need some training and good typing skills, but once you establish yourself with a service or some doctor's offices or practices, this can be a good way to make money from home.
A lot of other companies selling things, etc. CAN do well- but it depends on your organizational skills, your people skills and ability to 'sell' and also on the economy. People are not buying luxury goods, even in small doses like they used to. Based on my experience with clients in the past year, steer clear of things like scented candle parties, jewelry, etc. Good luck!