black market is important to the Bitcoin economy, and deserves to be mentioned.
Personally I would be happy, if Bitcoin was not used in any kind of illegal activity. But as it is unachievable, I see it as an unavoidable evil. I dislike many of laws that exist in the world, and I don't care if someone breaks them. But breaking the law always entails complications, which, I think, would be better to avoid at this stage. I believe, that systems like Bitcoin will change the world and will change the rules we live by, but it's still a long way to go to that point.
As to black market economy, let it develop on its own, no need to support it by listing in (a kind of) official directory.