Cash-flow muses
patio11: Has anyone actually done one of these?Yep, although I don't think I could comfortably describe it as a fun little sideline these days.See http://www.bingocardcreator.com/stats and look at the historical sales data: back in early 2007 when it was selling high three figures a month I think it would have been a fairly decent example of this.Tim Ferriss would not be my first suggestion for who to look for for advice on how to accomplish this.  I think he sells "You can avoid doing actual work!!!" when the real lesson is "You can do actual work very, very efficiently these days if you're prepared to spend significant amounts of time and mental effort laying the groundwork for it."Incidentally, the amount of time you spend on "manufacturing the product" is rounding error next to the amount of time you will spend on this project.  90% of the value happens outside your IDE.