Ian Storm Taylor: Never Use Black
Most of the body copy and other elements that are dark on pages are actually dark grey, not black. Black overpowers. This article explains it.
Black overpowers everything else.
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.
Lots of the apps we use on a daily basis have blacks that aren’t really blacks, but dark grays. Twitter’s sidebar, Sublime Text 2’s sidebar if you have Soda Dark installed (which you should!), new Photoshop’s background, the calendar widget. Even Twitter Bootstrap. They all use colors close to black, but slightly muted so they don’t overpower the rest of the elements on the screen.