I created FRUJI.com (Twitter Analytics service) and it keeps generating a minimum of about $50 a day, sometimes (often) more. It's fully self-maintained (unless the server or database crashes), which is just purely amazing. The machines sell, process the orders, upgrade, and provide the customer experience. All I did was programming it. I go for a run, my phone rings a couple of times, I look, PRO account purchased, PRO account purchased, THIS IS F* AWESOME.

I tried creating/selling other things to businesses. This time, it's mostly you and me's, paying it out of their own wallets. Never expected this to work so well.