There's a database of asteroids and how profitable they'd be.

Now all we need is space mining tech to take off. Pun intended.

We're already working on that, actually. There's a company called Planetary Resources that has been developing The ARKYD Space Telescope. They even have a Kickstarter Project that I've contributed about $100USD to. It's a really fascinating project, and I'm really excited about it. I think the prospects are enormous, and I feel that this represents a huge potential step in our journey toward the stars.