Vim users should go here: http://vimcolorschemetest.googlecode.com if they haven't before, that's where I found darkburn, a darker variant of zenburn that I've been happy with for a couple years.
Vivify [ http://bytefluent.com/vivify/ ] is another good one that takes the opposite approach: Show you code snippets from different languages at once and switch the colorscheme. You can also quickly scrub through the schemes and edit them to create your own.
