Fall in Love with a Problem, Not a Product

Excellent advice for software developers, even if you're not looking to lure investors:

...it all comes down to motivation. What investors want is someone whose animating purpose is to solve a particular problem (especially one that people don’t realize yet that they even have!) or fix something they think is broken. The product is just a means to that end, not an end in itself. To put it another way, you want someone who is more in love with fixing a problem than with the product itself.