Most of Apple's pro apps use a darker UI, which I find more pleasing and less strenuous on the eye.
I've tried UNO and ShapeShifter to apply a darker theme to the general OS, and largely have been pleased with my hacks to change the Aqua interface a little darker so it isn't as lickable. Aqua is so 2000. pfft
Illuminous (name and concept) sounds like a worthy successor to Aqua from what I've read, so far. It's time for a UI change anyway, so I'm giving this rumour a 7/10.
I've tried UNO and ShapeShifter to apply a darker theme to the general OS, and largely have been pleased with my hacks to change the Aqua interface a little darker so it isn't as lickable. Aqua is so 2000. pfft

Illuminous (name and concept) sounds like a worthy successor to Aqua from what I've read, so far. It's time for a UI change anyway, so I'm giving this rumour a 7/10.