- Professional advice and curation. I want to utilize topic experts to get the best results instead of spinning my own wheels and wasting time/effort. I will gladly pay someone if it saves me time and headache.
- Psychology/sociology. It always comes down to people and how they interact. What drives them. Projects that use or have a strong/clear relationship with sex are fascinating.
- Personal improvement. Being better. Living up to potential.
- Data. Understanding, organizing and utilizing it. We are creating so much of it, and yet hardly using any of it to actually make our lives better.
- Quick/small projects. Rapid iteration. Try something, validate and move on.
- Making money. Actually getting users to pay for things. Ultimate validation.

Inspired by Brad Feld. I think I might dig deeper.