I agree with Ian Storm Taylor¹ — stay away from #000000:

When you put pure black next to a set of meticulously picked colors, the black overpowers everything else. It stands out because it’s not natural. All of the “black” everyday objects around you have some amount of light bouncing off of them, which means they aren’t black, they’re dark gray. And that light probably has a tint to it, so they’re not even dark gray, they’re colored-dark gray.

Read his post for the very interesting full argument.