25% from a variety of iPhone apps, some paid, some ad-based
25% from ad-based Android ports of those apps / other Android apps
25% from ad-supported
25% from MySpace / Facebook with both ads and virtual currency
Stuff currently bringing in some money:
- Coolest Friends on MySpace
- Japan Name on iOS
- In-Between on iOS
I'm still quite far from my goal, but it's the first week of the year. It will be a lot of work, but should be doable.
Honestly from experience I know that there isn't really such a thing as "passive income". Things change and require updating. Sometimes you hit gold and get one thing making $1000 / day instead of a hundred things that combine to make $100 / day, and then of course you run with what you've got. But as a motivational tool, I think pursuing a variety of small things is a good psychological trick to get yourself working harder. And who knows, it might even be possible.