[SunkenCiv]

NEO Earth Close Approaches
http://neo.jpl.nasa.gov/ca/

NEOs Removed from Impact Risk Tables
http://neo.jpl.nasa.gov/risk/removed.html

[RightWhale]

WhenI was designing my asteroid mining business proposal I deliberately ignored earth orbit crossing bodies and assumed all mining would be in the main Asteroid Belt. Two reasons:

1. A lot more material to choose from, and

2. I needed to compute far fewer orbits.