Me too. I've got ideas, but nothing with a real market.
Forgive the ignorance, but what does this mean?
Think affiliate marketing, or niche product creation (targeted ebooks and the like), that require a bit of upfront effort, but little ongoing maintenance, and can scale out to many of these products/revenue streams. Lots of ongoing small hits, rather than one big payoff for one big product :)
That's exactly it. Lots of small products with microtransactions targeted towards niche markets that i barely have to touch.
Passive income generation is one of the pinnacles of what we as software engineers can do.